Kt88 Bias Chart
Tubes, tubes, tubes! Find everything from the field of tubes: premium selected TAD tubes, TAD blackplate tubes, our beloved tubesets for nearly every amplifier out there, more brands and accessories. 1: Re: EL34/6550?? (10. 6) bunları taktığımda kısa sürede bir problem olurmu? Çünkü bir çok lambayı denedikten sonra servise götürüp bias ayarını yaptırmak. This KT-88 based Push-Pull power amplifier received honor of many awards and has became our longest running power amplifier model for over 30 years. English here] 18: KT1807, KT88: Audio Power Amp: Single Ended: 572: Minivollamps single end with EL34: DE : Roehrensockel. Note: These cannot directly replace KT88, because the bias setting is another, and also the sockets are another type. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high sound pressure levels use hearing. seated length: 110mm Мах. KT88 is similar with CV5220 and 6550,they can be replaced by. To test out this hypothesis, I replaced the two JJ Teslas in my amp's left channel with my usual E-H 6550s. Typical bias on KT88 is 75ma, how much bias are you putting to them? You could email Jim McShane, he sells them and might have additional insight. This is required in all "fixed bias" amps when new power tubes are introduced. The BiasMaster is available in an octal and noval version. LTD of England) can be downloaded from frank. The KT88 is a beam tetrode/kinkless tetrode (hence "KT") vacuum tube for audio amplification. Trang tin tức online với nhiều tin mới nổi bật, tổng hợp tin tức 24 giờ qua, tin tức thời sự quan trọng và những tin thế giới mới nhất trong ngày mà bạn cần biết. Analog Metric Limited. Although a fair amount of detail is included, this is more a summary of the major developments rather than an exhaustive list of every project covered by the specialist press over the years. I'm trying to determine for 2 x KT88s in UL push pull what the best output transformer is (B+ 410 V and set for 80 ma bias / tube) , I can buys 4Ks , or 5Ks the output calculator gives the most. KT88 is similar with CV5220 and 6550,they can be replaced by. The GrooveTubes Bias Tool plugs right in where you would measure 6V6. Get rid of those annoying "snaps, crackles. Total AUM:$26. - KT88S beam tetrode. The bias pot is a variable resistor, but this isn't the resistor that they're speaking of. stereo tube amplifier inspire by dennis had class a single ended kt88 amplifier - $1,925. The speakers are a pair of Klipsch Forte II in parallel with Klipsch Chorus I The Shugang KT88-Z is a highly worthy tube for someone who listens to quiet-medium volume music and wants a sound that is highly reminiscent of. Evatco carries a wide range of El34 tubes and in fact carries over 30,000 tubes in stock ready to ship from our Brisbane warehouse. Amply 6L6 / KT88 ( bias tự động ). Название/Part No. 539B, 539C. I'm looking at the KT88 Oddwatt design for the build, any feedback on that choice? The 25W seems like it will be sufficient for my room given fairly efficient speakers. Seymour Duncan Guitar Pickups, Bass Pickups, Pedals. Achetez en toute sécurité et au meilleur prix sur eBay, la livraison est rapide. 00088A = 181k. Amplificatore artigianale di mia progettazione da 45+45 Watt RMS con KT88, notevoli peculiarità tecniche e sonore difficili da trovare in prodotti ECC82 ORIGINALI-6SN7(russe) - KT88 Psvane, la potenza è di 45W RMS/8 Ohm. It works nicely and has been double checked with other testers for results. VT-Chart Basing Chart Tube Settings Instructions Eye # 1 closes at bias of about 40. Adjust the bias pots slowly. Maybe not the top-of-the-charts manufacturer, but certainly one that is robust and perfectly maintains technical specifications. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. Genalex Gold Lion KT88 Power Tubes - Matched Quartet Matched Quartet of KT88 Power Tubes $229. VR tubes can set and regulate the screen voltages. 5” deep and weighing 157 lbs each, plan your system layout accordingly. 048 Electric Guitar Strings Ernie Ball Power Slinky Electric Strings are a perfect match for those who like chunky rhythms for rock and roll or blues. In the case of this amp with EL34's I would personally bias the power tubes around 30 mA. Before I get to the tubes there is something we need to consider about the Semi Auto Bias Module in the Elekit TU-8340VK. Specifically designed for audio amplification, the KT88 has similar ratings to the American 6550 which was designed for use as a servo amplifier. Cayin mt 45 mkii vacum amplifier used features. el34 #6l6 #kt88 Jam a 1965 strat & five point to piont marshall amps! #guitarmedia3. Building a Loop Bias Amplifier. 5 fm on Facebook. Service manuals, schematics, eproms for electrical technicians. It's still valid to try a cooler bias and so benefit from a longer tube life etc. shipping: + C $6. Chelmer Valve electronic tube KT88 , seperate cathode bias resistors. PubMed® comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. 0: 6SN7 (2), KT88 (2) 230: Audio Amplifier with transistor [In Dutch] Schematic Only. Same with the US one, they straight up admit on their website that it's just their personal opinion with no studies/proof. stereo tube amplifier inspire by dennis had class a single ended kt88 amplifier - $1,925. If you want to see an easy way to use them in a separate browser window. Evatco carries a wide range of El34 tubes and in fact carries over 30,000 tubes in stock ready to ship from our Brisbane warehouse. The Minotaur uses the well-regarded MJL3281 and MJL1302 transistor devices at the output in a modified Sziklai configuration for superior linearity. Last update of this mirror site: 2021-01-14 Electron tube Type: Brand: System: Data sheet. These celebrity activists are champions for social justice; Daveed Diggs: 'I worked harder on The Little Mermaid than anything else' Kodak Black has donated $150,000 to charity in five days since. A custom 6L6GC switching box was constructed to allow for a quick switch comparison of two tubes at a time while plugged into the V2 socket of the same fixed bias, single-ended guitar amplifier used for the frequency sweep. Tubes are tested either in the upper “quik-check” section using multiple tube sockets wired in the most popular pinout arrangements, allowing the mutual conductance (Gm) of most common “TV type” tubes to be measured; or the lower “switch” section allowing other less common tubes to be tested in. Instruction Manual And Special Bound Set of Roll Chart, Obsolete and Foreign Supplement (Save $5) Please specify which tester you have. Bench uses a glow tubes to bias his 845 tubes, using an 0C3 for 40mA bias current, or an 0B3 for 65mA. 845 Tube Amplifier Schematic. el34 #6l6 #kt88 Jam a 1965 strat & five point to piont marshall amps! #guitarmedia3. If it is 1-ohm, then the conversion ratio would be 1V/1-ohm = 1A, which would be far too high for most output tubes, such as the 2A3 or 300B (or triode-connected EL34 or KT88). For self-biasing. KT88-T is a beam power tetreode, its anode limited dissipation power is 42W. 8Pin Valve Tube Socket Cathode&Plate Bias Current Probe Tester for 6L6 EL34 KT88. Global input / output level controls. 31 1 speaker load 680Ω, 2W 282-680-RC 0. Tube Type and Plate-to-Cathode Voltage must be entered for all calculations on this webpage. This is a comparison of 6L6 power tubes in a Fender Super Reverb Reissue. Genelex 26dBW amplifier, 10 KT88 schematic (42k) Grommes-Precision-Frazier G-101A, F-106C 20 dBW power amplifier, 4 6GT5 schematic (39k) Hammond Organ Type E 16dBW main amplifier, 2 7591A schematic (104k) Heathkit AA-50 14 dBW Integrated Amplifier, 2 7591A schematic page 1 (344k), schematic page 2 (334k). for sale! a return of a favoriteeven betterthe kt-88 inspiresingle-ended class afire-bottlethe tube rollers 154222897445. Tube type: ----Choose---- 6V6 EL84/6BQ5 5881 EL34 KT66 6L6GC KT88/6550. Please fill this form, we will try to respond as soon as possible. Page 91 Osd Overdrive Special Desgin Amp Builders Guide. The KT88 fits a standard eight-pin octal socket and has similar pinout and applications as the 6L6 and EL34. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. TUBES: 2-KT88/6550 output, 12AX7, 12AU7, 12BH7, 12AT7/12AZ7. Tube Type and Plate-to-Cathode Voltage must be entered for all calculations on this webpage. In order to run a pentode in pentode mode, not triode-mode, we must establish a fixed cathode-to-screen voltage. amptata v8 vacuum el34 kt88 6l6 tube tester bias current ma checker octal match. Roll Chart In Book Form (Latest Chart Available From Hickok) $15. Photo by Andy Ellis. When driven close to its maximum output, the bias will change several volts, becoming more negative by roughly four to six volts. Obsolete Tube Roll Chart Supplement Book (contains tubes not on roll chart) $15. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. : Lieber Natalie, : beim Einstellen des BIAS, auf deutsch Ruhestrom, : leuchtet bei zu niedriger Einstellung die untere gelbe Led der jeweiligen Röhre, bei korrekter Einstellung geht dann die mittlere Grüne an. Nun mal meine Frage: Wie hoch stellt man am besten den BIAS für die KT88 ein?! Wie hoch stellt man am besten den BIAS für die KT88 ein?! Bei der EL34 hatte ich ca. Operating in class A up to 400 watts, the XA200. This calculator uses the power equation. Email: [email protected] Secondary can be configured for a 4 ohm or 8 ohm load•Easy Biasing with top panel bias testing of 6550/KT88 power output; 2 pcs. That’s an interesting feature of course, but a bit of overkill for a trivial feature like the one exposed in this article. Vor 2 years. The bias pot is a variable resistor, but this isn't the resistor that they're speaking of. The KT88 is a commercial version of the CV5220 and is similar to * It is essential to use two separate cathode bias resistors. The 8417 is a different tube than 6550. Some KT66's will not. It seems that regardless of how well matched the tubes are, they are not perfect. A KT88 production line of a large factory is always automated. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. Hi, and first of all, congratulations for this nice blog that I just discovered. It works brilliantly when characterizing high power output tubes e. The power section has four KT88 tubes. It was manufactured in the U. Amptata T3 Valve Tester Bias Current Checker Tube Match Tool6V6 KT120 KT88. Blueglow Electronics. There is very little to go wrong. Enter values in blue and click any Calculate button. The KT88 also can handle larger plate voltages, up to 800 volts. 0: 12AX7, 6V6: 231: DIY Plasma-Tweeter: Looks better than the other one. 1968-69 Marshall Major Plexi 200 Watt KT88 Vintage Genelec Tubes, Killer!! 19th 1973which ties in with the date noted on the amp inspection chart faulty bias. KT88 - (TRIODE) PARALLEL PUSH-PULL 60WATT AMPLIFIER KT88 - TRIODE Parallel Push-Pull 60Watt Mono-Block Music Amplifier Contents. KT88X - slotted optical switches phototramsistor output by optek. It is like matching the engine RPM to the proper gear in a race car to achieve optimum performance for the desired speed. Then I put the fully regulated version of my KT88 amp back in. A Wrong Way to The Top. Push-Pull Fixed Bias. First, I listened to the initial three discs in my review pile. The letters “CCW” in the BIAS column, under METER SETTING, represents “counter-clockwise. It is important to bias a tube to stay within its rated dissipation. Same procedures can be applied to other models that include AS-8iMKIII, AS-3i (EL34), AS-3i (KT66), AS-6M (KT88), etc. Power tubes (aka output tubes) are typically the biggest ones of the bunch, and they provide the last stage of amplification for the guitar signal before it’s delivered to the speakers. CAPACITANCES (measured on a cold unscreened tube) Triode Connection C 7. The CCS provides the bias much like a cathode resistor would. BIAS AMP gives you the power to create new sounds by designing your own dream amplifier, letting you swap out tubes, customize preamps, power amps, transformers, tone stacks, multi-mic capability and open/closed back cabinet, all via a powerful and intuitive photo-realistic interface. continuous output power, total harmonic distortion(THD), frequency response, square wave and actual music test. stoned: be human. Możesz wybrać ten, który preferujesz. pdf), Text File (. Besides wiring up the tube correctly, you need to set the bias and screen voltages to work with whatever tube you pick to use. I'd like to get my hands on one and run through it with a signal generator and a scope. Plate Bias Current Probe Tester 8Pin Socket for 6L6 6V6 EL34 KT88 6550 Tube Amp. (as a side note the bias on that chart is the -ve voltage reading on the grids (pin 5) of the tubes, NOT bias current). Email: [email protected] Inspect for poor soldering and loose connections, correct when necessary. This morning I turned it on with the radio and after about 3 minutes, the left channel started crackling and distorting. 0 on 11 Dec 2017; Terminal chart data cycle 24-2017; Notice. The amp started life with a 6N1P driver tube and a KT88 in each channel. This amp is bias modded so it actually runs properly for KT88s. Please note that the reading is the sum of 2 power tubes. Genalex Gold Lion KT-88 reissues - good stock on hand! The listening reports are virtually unanimous, regardless of what gear the tubes go in. Original - the standard calculation Version 2 - the output power of the amp steps down at each voltage level Version 3 - the same currents, 50,60,70,100% are applied at each. I have seen 150k and 220k as well. For self-biasing. Moc wyjściowa dla trybie pentody wynosi 45 watów, a dla triody. This comparison only covers the external structural differences. KT88/6550C? Das würde mich sehr interessieren Liebe Grüße Nicki. TY - paper TI - Complete Journal: Volume 27 Issue 5 SP - EP - PY - 1979 JO - Journal of the Audio Engineering Society IS - 5 VO - 27 VL - 27. kt88/6550 is a different animal, look for a little over 80 watts a pair. 4 KT88/6550/KT90/300B or 4 x EL34, 5881, 6L6GC, 807. Cross-validation. That's because Trader On Chart allows you to preset your trade details like lot size, stop loss, take profit, breakeven point, trailing stop, etc. Tubes compatibility / Bias values Bellow you will find a bias chart for the most common compatible tubes for integre4. Raytheon This tube is KT-120 Tung-Sol. (Totally unrelated and unsolicited, if you have a KT88 based amp, buy the Sophia Blue Bottle 88s) So taking the McGary SA-1 on its own merits rates rather high. Find news sources, explore our data and methodology, and request ratings. Instead of those pricey KT-88's, how about maybe three 7984's since you have a big pile of them? I am attaching a similar circuit that someone did (author unknown) First, ground the cathode. The gain of this amplifier is near -100 for zero bias, decreasing to -8 at a bias of -12V. stoned: We evaluate what others say and do, resepct never enters. 2 mm DC plug; Tube socket cable length: 23cm. At least try KT88s! Substitutes: 6550, 6550A, KT90 Type 2 or 3, KT99, KT100, KT12O/KT150 (only if sufficient bias is present) Though your manufacturer may have settled on a certain brand of these, the hunt for cool NOS types may be. I bias the amps while playing them to find the swet spot with whatever particular set of tubes is in the amp. Final assembly. Typically these are in the 30 watt and under power range, but not all lower wattage amplifiers are cathode biased amplifiers. (Symbol " # " on roll chart) Set BIAS VOLTS at 40, press and hold down button indicated in the PRESS column while rotating BIAS VOLTS control until tube strikes. The 7189 is a high reliability tube, which can produce 6 watts. According to OSHA, any exposure in excess of these permissible limits could result in some hearing loss. At 19” wide, 11” tall, 27. An alternative, which I have used in some of my designs, is to apply a high negative bias to the grid during warm-up, then after a delay, drop the bias to the normal level. The EZ bias system uses LEDs so no meter is required. Up for sale is my Art Audio Concerto MK2 valve power amp, bought late last year from Mike on this forum (Mike Adams) who is a friend of Tom Willis, the designer. Specifically designed for audio amplification A KT88 push-pull pair in class AB1 fixed bias is capable of 100 watts of output with 2. 8417, KT77, KT66, 6L6-GC, 58810utput tubes, using with triode connected output tubes 5. Increases gain, sustain, tone and in some cases converts a bias balance pot to a true bias pot. Factory settings for 6L6 at either TEST POINT is 72mV, EL34 = 76mV, 6550/KT88 = 84mV. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. stoned: be human. If you see an item listed but can't find a Price Code. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. A wide variety of kt88 amps options are available to you, such as channels. LTD of England) can be downloaded from frank. I understand the 538/538A uses the same conditions, but that also seems like a rare model. It allows you to remember past events, process all of the present sensory impressions, and project all of your thoughts, memories and estimations into the future. Everything would look normal, but when I played reggae music through the amplifier, it would over heat and the plates of the KT88 would run red, especially when I played a mix from the great King Tubby’s that had subsonic drum and bass frequencies as well as razor sharp high frequencies I would have to re -bias the KT88 and make other changes. KT88X - slotted optical switches phototramsistor output by optek. The amplifier has very few. HEATER V h. Adjust the bias pots slowly. Typically this is negative 12volts for a EL84, -35 for a EL34 and -50 volts for a KT 88. English here] 18: KT1807, KT88: Audio Power Amp: Single Ended: 572: Minivollamps single end with EL34: DE : Roehrensockel. The conventional three way guitar EQ network, or tone stack (a. WEBER BIAS SETTINGS. What are you talking about? We are talking a EL34 to KT77 switch. The other tube that would run without to many changes is the KT66, in fact the KT66 may sound better, compare the KT88 to a 300B and the KT66 to a 2A3 and you get the picture. At the time Philips had already developed and patented power pentode designs, which were rapidly replacing power triodes due to their greater efficiency. ··· Suddenly, I have found the important point. Ernie Ball Power Slinky Guitar String Set 11 - 48 Ernie Ball 2220 Power Slinky. I find the EL34s supply plenty of power but when the time comes I will upgrade to the KT120s as they have do have a tighter bass and cleaner highs. 5% total harmonic distortion or up to The KT88 was introduced by GEC in 1956 as a larger variant of the KT66. No manual, not much out there about this amp. Perform cross-validation and save ROC curve points to the roc-curve output file. The 6550 provides a loud clean tone and is also popular in Bass amplifiers. The KT88-Shuguang has an absolute maximum anode dissipation rating of 50W and is designed for use in the output stage of an a. For example, EL34, 6550/KT88, maybe EL156 is enthusiastic choice, 8417 will be maniac, or I have four PL519 stock. The gain of this amplifier is near -100 for zero bias, decreasing to -8 at a bias of -12V. Its exclusive screen-grid radiator fins reduce a major source of. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. so, if you like power amp saturation, don't go with them. Weight 50 lb. Electro-Harmonix tubes are all new designs and are of excellent quality. Makes your silver face sound as good (or at least close) to a black face version. B iasing by negative grid voltage is highly inaccurate because the same grid voltage can produce drastically different plate currents in different tubes of the same type. Lots of people hold the view that you should not use chinese KT88 tubes and that their use leads to different problems in many units. The amp is in the highly desirable chrome finish and is 6 years old. This graph is based on the average gain and noise measured from different tube brands using the same number of samples for each brand. APPLICATION A Very high performance output transformer for push-pull KT88 or similar valves operating in fixed bias mode. Page 91 Osd Overdrive Special Desgin Amp Builders Guide. Small signal tubes with numbers like 12AX7, 12AU7, and 6922, and rectifier tubes like 5AR4 may go 10,000 hours. The 6L6, 7581A, 6V6, 6550, EL34, 5881, KT66, KT88, KT90, KT100, etc. Tube Bias calculator. 1, but the crossover distortion created by the non-linear section of the transistor’s input characteristic curve, near to cut off in class B is overcome. Abbreviations. (The last two readings were for a different tube than was used to test the other six testers. EL34 thru KT88's are cooking territory. Bias is the negative voltage we put on the control grid of a tube to make the tube conduct the current we desire. TUBES To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. All cathode biased amps generate the bias voltage from one resistor, so the average of the four tubes is summed together to form the bias voltage. Ok, first I adjust the bias for a quad of Electro Harmonix KT88EH tubes and then reset the AC balance adjustment. Slowly increase the value of the class-A bias trimpot until the class-AB 'imbalance' reading nulls to zero; then adjust the class-AB trimpot for an average 40mV of quiescent bias per output pair. KT88 - Single Ended Tube Amplifier Build 2018 - Part 1. Guest 01:51:37 am: Viewing the topic [Solved] Following + Inverting buffers for 555's output (transistor option). 31 1 speaker load 680Ω, 2W 282-680-RC 0. wvx: 2006-10-03 00:00 : 188 : BCA-castels. Selectable power tubes with individual bias controls. Tubes, tubes, tubes! Find everything from the field of tubes: premium selected TAD tubes, TAD blackplate tubes, our beloved tubesets for nearly every amplifier out there, more brands and accessories. New vol pot, KT88's, Mercury magnetics reverb xfmr, and a re-bias. This is a comparison of 6L6 power tubes in a Fender Super Reverb Reissue. Photos and chart comparing the Russian-made Genalex Gold Lion N709 / EL84 reissue with the current production Sovtek EL84 and vintage British CV2975 (similar to the original Genalex EL84 / N709). It can handle 60V more on the Plate and 100 Volts more on the Screen, but transconductance, bias and Impedance are another. Tube Rolling Guide. A KT88 production line of a large factory is always automated. C, also labelled as. First, I listened to the initial three discs in my review pile. 1954 (and very obolete even then; see TR1). I immediately notice a subtle yet definite change in the sound. ··· Suddenly, I have found the important point. This is a comparison of 6L6 power tubes in a Fender Super Reverb Reissue. If one is to give a reliable evaluation of a 300B, it is essential that the tube be burned in for an appreciable amount of time (footnote 4). KT88-2400 Digital Brain Electric Activity Mapping collects EEG signal with electrodes, via integrated amplification, A/D transformation, PC auto-analysis, FFT, to form electroencephalogram that displays with color depth. Genalex Gold Lion KT-88 reissues - good stock on hand! The listening reports are virtually unanimous, regardless of what gear the tubes go in. com 19:39:47 01/10/06 ( 1) Re: 6550/KT88 bias - Kajtsu 05:36:06 01/11/06 ( 0). Valve Type: *KT88 DIAMOND*. (Symbol " # " on roll chart) Set BIAS VOLTS at 40, press and hold down button indicated in the PRESS column while rotating BIAS VOLTS control until tube strikes. Make sure your bias switch on the side is set to the KT88 KT120 position. (8) KT88, (4) 12AX7A and (4) 12AT7 vacuum tubes. The fully regulated version outputs 65 watts/ch from about 26. The worst was Preferred Series from the Tube Store. continuous output power, total harmonic distortion(THD), frequency response, square wave and actual music test. If this is your first visit, be sure to check out the FAQ by clicking the link above. If you have an amp which uses power tubes which are not listed above, you will need to consult a spec manual (the RCA RC-30 Receiving Tube Manual is one of the best) for the basing, and adjust. 4 KT88/6550/KT90/300B or 4 x EL34, 5881, 6L6GC, 807. Specifically designed for audio amplification A KT88 push-pull pair in class AB1 fixed bias is capable of 100 watts of output with 2. 5% total harmonic distortion or up to about 50W at low distortion. The product is applicable for checking such diseases as epilepsy. SE Amp CAD KT88 Results Date 8/18/2012 GlassWare™ Circuit Setup Output Tube Type KT88 X 1 Output Transformer Hammond T1627SE Bias Method Fixed Plate Load Resistance 2. I have four charts for class ab 6v6 fixed bias alone. test data roll chart housing. In High-Bias mode, the output stage quiescent current is increased so that it operates in Class A up to about 5 watts per channel into that same 8 Ohm load. Although a fair amount of detail is included, this is more a summary of the major developments rather than an exhaustive list of every project covered by the specialist press over the years. The only problem with this is that it will take 105V to spark the diode tubes, and this is 60V higher than the original Sakuma design - it's not a matter of increased current but of what my final B+ will be with the transformers and filters. One hundred hours are not enough; 200 hours seems to be a workable minimum (footnote 5). I unusually install a 3 wire cord for safety sake. That would mean 54 mA per tube. This circuit is under:, audio, vacuum tubes, Vented 2a3p 2a3pp 15w Tube Amplifier circuit diagram l60487 Elliot vented 2A3PP line, is also very simple, the key is the quality of the output of cattle. 4 could be used to indicate a quiescent bias current indication. Name Last modified Size Description; Parent Directory - 050831ham_operator_530pm. When testing a 6V6, a somewhat lower - current tube of the same type as the 6L6, the testers all agreed closely: 4300, 4300, 4400, 4300, 4200, 4200, 4500, and 4500. This is an amp that provided hours and hours of balanced delivery. To avoid serious and permanent tube damage when constructing an amplifier, always ensure the grid bias voltage is present at grids 1, 2 and 3 before applying B+ high voltages to the circuit. The -V Bias adjustment, KT88 quiescent current calibration and the Output transformer will be described, showing alternative variations used in different valve amplifiers, and why the Williamson design was chosen as the most effective method to achieve the best possible performance. The Forum for High End Audio. Name Last modified Size Description; Parent Directory - 050831ham_operator_530pm. Most 6550 based amplifiers can take a KT88 with just a bias. 5, 1, 7 or 15 Watts of output, the Rocker 15 is an extremely portable combo that moves seamlessly from the home to the studio to the stage. Nissan X-Trail I. Added bias pot for easy changing power tubes. Look up the number and letter code in the chart to select the correct socket. In many cases the bias will be set in the center of the acceptable range so random pairs of output tubes will work safely with the intended load range, eg. If this is your first visit, be sure to check out the FAQ by clicking the link above. C , also labelled as. amptata v8 vacuum el34 kt88 6l6 tube tester bias current ma checker octal match. One reader asked if the. Note: With new tubes, the bias current can be expected to drift significantly for the first 24-48 hours. Some users have reported detailed. diameter *It is essential to use two separate cathode bias resistors. T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. and British musicians in favor of which are modified and uprated in power dissipation rating from their KT88 and EL34 prototypes. My Marshalls are all biased a little differently. Increases gain, sustain, tone and in some cases converts a bias balance pot to a true bias pot. Re: 6550/KT88 bias - Kajtsu 05:56:12 01/10/06 (2) Re: 6550/KT88 bias - [email protected] The product is applicable for checking such diseases as epilepsy, intracranial. Get rid of those annoying "snaps, crackles. The conventional three way guitar EQ network, or tone stack (a. Tube type: ----Choose---- 6V6 EL84/6BQ5 5881 EL34 KT66 6L6GC KT88/6550. Adjust the bias pots slowly. Since Mullard is responsible for the best sounding EL-84’s, I took their advice. I mean you can build a simple SE with only a spare components. Bias bias adjustment device can be designed according to the level of the table to fine-tune the power value of the working value of large tubes in order to achieve the best working conditions to facilitate the players at any time to monitor fine-tuning or replacement of different brands of tube. The KT88 is also suitable for use as a series valve in stabilized power supply. The GrooveTubes Bias Tool plugs right in where you would measure 6V6. Check and replace leaky capacitors when necessary. In many cases the bias will be set in the center of the acceptable range so random pairs of output tubes will work safely with the intended load range, eg. Report "KT88-3200 Opration 090911". BG157 - New series on how to build a KT88 Single Ended Amplifier. Good to go!. I fired up the new quads with Paul Simon’s Live Rhymin’, and sit back for a listen. 5% total harmonic distortion or up to The KT88 was introduced by GEC in 1956 as a larger variant of the KT66. Then I put the fully regulated version of my KT88 amp back in. 6550/KT88/KT90 grubu lambalar için tasarlanmış birçok amplide KT120 lamba (bias ayarlarının doğru yapılması kaydıyla) sorunsuz olarak çalışabilmekte, ancak yine de herhangi bir şüpheye yer bırakmamak için ampli üreticilerinden görüş alınmasını öneriyoruz. Tubes are tested either in the upper “quik-check” section using multiple tube sockets wired in the most popular pinout arrangements, allowing the mutual conductance (Gm) of most common “TV type” tubes to be measured; or the lower “switch” section allowing other less common tubes to be tested in. My Marshalls are all biased a little differently. KT66, I have in my amp, it was EL34 to begin with, all it took was a visit to the tech and he adjusted the bias, I will NEVER use EL34's again. Loading interactive chart. Ditto for Mesa. This comparison only covers the external structural differences. LP2 DHT tube input as second stage. For example, suppose the grid bias is -12 volts at no signal. Home / Schematics / Ella Push Pull EL34/KT88 Amplifier Schematic. Amptata V8 Vacuum Tube Tester Bias Current Checker mA Version KT88 EL34 6L6 6V6. My personal theory: all the parts within the Super Lead (or any other amp for that matter) are designed to operate at a given set voltage. I have seen 150k and 220k as well. The tubes are Ruby (JJ), TungSol, Svetlana (new production), used old stock GE 6L6GC (test strong) and NOS RCA black plate 6L6GC. Of course, the bias point must not be pushed above the maximum dissipation curve, and it is usual to bias well under it to avoid damage (70% of maximum dissipation is often recommended, although anything up to about 85% would be ok). 7 ma U g1 = -15 V S = 11,5 ma/V R i = 12 kΩ µ-g1-g2 = 8 Triode Connected U a, g2 = 250 V I a+g2 = 147 ma U g1 = -15 V S = 12 ma/V R i = 670 Ω µ = 8 Red/Blue versions available max 125,0 max 52,0 max 110,0. Knowing the political bias of media outlets allows you to consume a balanced news diet and avoid manipulation and fake news. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high sound pressure levels use hearing. Amply 6L6 / KT88 ( bias tự động ). In fact, a friend give me a spare matched quad of NOS (plain old) Gold Lion tubes + the needed output. Valve Type: *KT88 DIAMOND*. pdf), Text File (. 88 milliamps of plate current and a bias voltage of -1. Aufrufe 49 Tsd. Run in class AB1 push/pull, a pair of KT88's are capable of producing 100 watts at 2. Tube Type. An interactive data visualization tool that displays ratings of news (and "news-like") articles and sources The Media Bias Chart is a resource to help you navigate the complex media landscape. Tube Rolling Guide. A super value compared with TV-10 and TV-7. 39 shipping. Re-set the bias from zero current after two hours of normal use. T1 tester can measures the cathode current of the power tube for bias reading (at low voltage side of the tubes ) T1 suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027 etc. hurting real bad. KT88 has an designed maximum anode dissipation rating of 35W and is recommended for use in the output stage of an a. Name Last modified Size Description; Parent Directory - 050831ham_operator_530pm. The letters “FS” and “RL” in the SIG VR column represent “full scale” and “red line” respectively. It was manufactured in the U. Typically, bias circuits are used to keep the grid slightly negative with respect to ground, but for this purpose, a bias circuit would introduce more complexity than its worth. From the highly respected UK outfit based in Leicester, this is one amp that most of the media has (criminally) ignored but is a great, small footprint (for the company, at any rate) valve-driven device that includes a headphone socket at the front with a neat, two-position, input selector and volume control. In this regard, cathode bias and back bias configurations are safer and more reliable designs than fixed bias. This KT-88 based Push-Pull power amplifier received honor of many awards and has became our longest running power amplifier model for over 30 years. The KT88 also can handle larger plate voltages, up to 800 volts. Leo Fender crafted guitar amplifier masterpieces without the assistance of computers, software or the Internet In 1959 "graphical methods" meant drawing Bode plots with a pencil and ruler. That would mean 54 mA per tube. KT88 in this case) are correctly. Two summers ago I'd had her modded to run a pair KT88's as she was constantly redplating 6550's. Weight 50 lb. Check the roll chart to make sure it's intact and rolls smoothly. After winning the gold medal of『Music Player (¥120,000 to ¥200,000) Category ②』of the Fujiya-Avic Headphone Festival Award 2019 Spring in June, Cayin’s N6ii has received another influential award of the year, the Best All-round DAP of 2019 by Headphonia. Home / Schematics / Ella Push Pull EL34/KT88 Amplifier Schematic. ) Antenna EFHW Zepp with no vertical element (to reduce ground wave radiation) L-Match tuner. The KT88 audio tube is considered to be one of the best sounding power tubes for hifi tube audio amplifiers. The worst was Preferred Series from the Tube Store. This KT-88 based Push-Pull power amplifier received honor of many awards and has became our longest running power amplifier model for over 30 years. When the grid bias is properly set, the tubes are balanced in the circuit and produce a clean, powerful signal. KT88 BEAM POWER TETRODE T he Svetlana™ KT88 is a beam power tetrode having a large standard octal base and glass envelope. Ok, first I adjust the bias for a quad of Electro Harmonix KT88EH tubes and then reset the AC balance adjustment. Moc wyjściowa dla trybie pentody wynosi 45 watów, a dla triody. The KT88 is based on the 6550 but even more refined and boosted. Amplifiers using EL34 6L6 6V6 tubes can be tested with the same method. so you can use 2A3,45,71A,KT88 and 300B as single ended amplifier. Bias is a negative voltage applied to a power tube's control grid, to set the amount of idle current the tube draws. With a gold-plated molybdenum alloy grid and carbon-coated screen grid, the Svetlana KT88 is the finest power tube of its type being manufactured today. Clic( button to switch to power chart map. The bias current is set purely by the input bias voltage. For fixed bias amps, the possibilities are potentially more numerous. This paper charts the course of Do-It-Yourself hi-fi in the UK. The KT88 is also suitable for use as a series valve in stabilized power supply. 1 bias supply KT88 22K, 1/2W 71-RN65D-F-22. BG157 - New series on how to build a KT88 Single Ended Amplifier. The purpose of this KT88 / KT66 /6550 / KT90 / KT120 page is to give an overview about what KT66, KT88. In order to run a pentode in pentode mode, not triode-mode, we must establish a fixed cathode-to-screen voltage. The MESA® STR 488 is the premium KT-88 of choice for our all-tube Prodigy and Strategy Bass Amps. 845 Reference Amp with Fiat. from 20 Hz to almost 90Khz small NFB will. Valve Type: *KT88 DIAMOND*. LM-88IA Amplifier can operate in two different ways Auto-biased or Fixed bias. ) will change optimum plate to plate load impedance. I took out my EL34 tubes that came in my PrimaLuna Dialogue Premium HP Integrated and everything just opened up, it now sounds like I wish it did when it came from PrimaLuna. But to say it switches to class AB from A is a contradictory statement and doesn't make technical sense. If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. 8 illustrates an example flow chart for an example 6550, 5881, KT66, KT88, etc. Undoubtedly, the tone will change somewhat as the bias of the power tubes will change corresponding with the reduction of voltage. Many OEMs use relabeled Electro-Harmonix vacuum tubes in their amplifiers. This shows the bobbin of 300W amp OPT bobbin being wound on the home built winding lathe. Genelex 26dBW amplifier, 10 KT88 schematic (42k) Grommes-Precision-Frazier G-101A, F-106C 20 dBW power amplifier, 4 6GT5 schematic (39k) Hammond Organ Type E 16dBW main amplifier, 2 7591A schematic (104k) Heathkit AA-50 14 dBW Integrated Amplifier, 2 7591A schematic page 1 (344k), schematic page 2 (334k). It seems that regardless of how well matched the tubes are, they are not perfect. KT88KT88 labelled G. This is a comparison of 6L6 power tubes in a Fender Super Reverb Reissue. The driver uses an input transformer to do the phase splitting (a Sowter type 3575-C, available form Note you will likely have to adjust the B+ voltage and the cathode bias resistors for tubes other than the EL34, 6L6, or KT88!. A wide variety of kt88 amps options are available to you, such as channels. Had the work done over at Savage Audio. It was manufactured in the U. fThe distortion will vary according to the degree of matching. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. Beam Pentode 6v 3v Indirectily Heated. 5% total harmonic distortion or up to The KT88 was introduced by GEC in 1956 as a larger variant of the KT66. In this article, the 6550 is used in a clean, sweet-sounding, single-ended design. 0: 12AX7, 6V6: 231: DIY Plasma-Tweeter: Looks better than the other one. com offers 874 kt88 amps products. capability is 20W. I mentioned KT88 and EL509 tubes, both of which are pentodes. MUZISHARE X7 KT88 x4 Push has been added to your Cart. The KT88 fits a standard eight-pin octal socket and has similar pinout and applications as the 6L6 and EL34. Con poche misurazioni il programma calcola la corrente CORRETTA da impostare sull'amplificatore che sia marshall, fender, orange, fbt o autocostruito. and tube charts for thousands of tubes. Alphabetical index of key terms at Lenard Audio Institute. Operating in class A up to 400 watts, the XA200. If you have an amp which uses power tubes which are not listed above, you will need to consult a spec manual (the RCA RC-30 Receiving Tube Manual is one of the best) for the basing, and adjust. Primary Resistance 62 ohm Tube Data Amplification Factor (µ) 7. The Blackstar HT20 RH is a lovely sounding amp, especially through the Celestion greenback speaker. Amptata V8 Vacuum Tube Tester Bias Current Checker mA Version KT88 EL34 6L6 6V6. In the case of this amp with EL34's I would personally bias the power tubes around 30 mA. Trust me, I'm kicking myself. I have seen 150k and 220k as well. For the tubes, I decided to use some KT88. KT90 and types and brands exist, and what you can do with the this tube. I usually bias EL34 and KT77 at 38ma, but want to try these at max bias, what ever that may be. I almost bought some tube amp books to learn more about hifi tube amps, but I'm not going to be interested in modding the circuit, is there really any benefit to reading them?. continuous output power, total harmonic distortion(THD), frequency response, square wave and actual music test. The KT88 fits a standard eight-pin octal socket and has similar pinout and applications as the 6L6 and EL34. Choosing a bias point: Because we are using a reactive load rather than a resistive one (i. This may seem like sheer madness, but, thanks to manual bias adjustment, it presents no threat to either the tubes or the integrity of the Bruce Moore amp. Each tube in this comparison was installed in the same custom-built, fixed-bias single-ended guitar amplifier in order to obtain the voltage gain measurements and conduct listening tests. Bias Calculator. My tech says the 88's are even. Euronext - Euronext Delayed Price. The AllSides Media Bias Chart™ helps you to easily identify different perspectives so you can get the full picture and think for yourself. kt88 bias chart. I bolted out of the kitchen to save it but I was too late. Tube Bias Calculator Instructions & Help. Intermodulation. are common guitar amplifier power tubes, and are all easily biased with this method. I have been enjoying for more than a year now the Amphion Argon 3L (floorstanders, but otherwise extremely similar to the Argon 3 bookshelves), driven by a Copland CTA-405 (full tube, KT88, 50 wpc), and all I can say is that the result is simply amazing (specially considering the price when compared to some more. i for now want to use a 12ax7 since there is a 9 pin socket already. In the JD-1000P Level-2 mod we do the following [retrofit $1,000 + frt to your amp, New modified units are $2,790 + frt]:. The KT88 fits a standard eight-pin octal socket and has similar pinout and applications as the 6L6 and EL34. For 70W/4R=2x35W/8R use 30V rails. Nobsound Vacuum Tube Amp Amplifier Plate Bias Current Probe Tester 8 Pin Socket for EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, 7027 (CT1-C, Cathode Current) 4. Amplifiers using EL34 6L6 6V6 tubes can be tested with the same method. B&K “Dyna-Quik” model 700 combination mutual conductance and emissions tube tester. Hi All,I have & enjoy greatly a Cary 88R 'Rocket' tube amp combined with a Cary SLP98P preamp, Wireworld Gold Eclipse cables, & Harbeth 7es-2 sp The amps owners manual states the amp can use EL34, 6550, KT66, KT77, KT88, or KT90 output tubes, but mentions only one bias setting of. The input bias currents are junction leakage currents which approximately double for every 10°C increase in the junction temperature. The only problem with this is that it will take 105V to spark the diode tubes, and this is 60V higher than the original Sakuma design - it's not a matter of increased current but of what my final B+ will be with the transformers and filters. All switches and knobs are present. ElPaso TubeAmps. Bias and Valves. BG209 - Wiring up the KT88 cathode bias resistors, 6N1P driver tube, how to select LEDs for your cathode bias on the driver tube. Before turning on the amplifier, please ensure all the power tubes (i. (c) A two range (0-10, 0-50) D. The module doesn’t “know” is if it’s adjusting the bias on a 6L6, 6550, KT150 or any other tube. Good to go!. ), KW Vanguard (6146 PA 2x 6L6 Mod. The NRR-1 core circuit is mainly based on a famous boutique preamplifier made in '88, modded to suit Cristiano's needs in the best possible way. Run in class AB1 push/pull, a pair of KT88's are capable of producing 100 watts at 2. 100) M, i like the browner tone of the EL34 over the typical 6550. LP2 DHT tube input as second stage. ICON AUDIO MP3 Price: £450 www. The KT88 also can handle larger plate voltages, up to 800 volts. It seems that regardless of how well matched the tubes are, they are not perfect. This product is suitable for EL34,KT88,6L6,6V6,5881,6550,KT66,KT100,KT120,7027. Ampeg AX70 Schematic 70 watt RMS 1-12 Guitar Combo. Added bias pot for easy changing power tubes. For fixed bias amps, the possibilities are potentially more numerous. If you wonder why you can't find "CLICK HERE TO BUY" buttons. If you go to this website you can punch in the tire sizes and it will give you size differences and speed and engine revolution difference. 048 Electric Guitar Strings Ernie Ball Power Slinky Electric Strings are a perfect match for those who like chunky rhythms for rock and roll or blues. 31 1 speaker load 680Ω, 2W 282-680-RC 0. Ampeg AC12 Schematic 20 watt RMS 1-12 Guitar Combo. Single Ended 2 x 8 Watt Class "A" (KT88) Uses push-pull 6SN7, then KT88. wvx: 2006-10-03 00:00 : 188 : 3da0tm-cq-6june2015-1645z-14193khz. 100) M, i like the browner tone of the EL34 over the typical 6550. Make sure your bias switch on the side is set to the KT88 KT120 position. Instruction Manual And Special Bound Set of Roll Chart, Obsolete and Foreign Supplement (Save $5) Please specify which tester you have. Total AUM:$26. Due to its enlarged bias current window, the SE can run not only with EL34, 6CA7, 6L6, KT66, KT77 or 5881 but also the higher-current 6550, KT88, KT90 or KT100. All metal case. Since Mullard is responsible for the best sounding EL-84’s, I took their advice. KT88 (3) Not Applicable (4) 40241 Preamp Tubes Clear Facets. Same with the US one, they straight up admit on their website that it's just their personal opinion with no studies/proof. aside from the tonal differences between tube models (and individual tubes, really), you get more clean headroom when using kt88/6550's. Tube Amp Bias Too High. The EICO is a factory built tester and I have included the most current manual of settings and otherwise. 6c33, KT88 Röhrenverstärker etc. The best way to understand bias is to think of it like the idle setting on a car. [In German. Viewing the topic DC bias in transformer. Nowadays most cars have complex computers that control the idle, however, in the end. Re: 6550/KT88 bias - Kajtsu 05:56:12 01/10/06 (2) Re: 6550/KT88 bias - [email protected] Can test older non-key way tubes. VT-Chart Basing Chart Tube Settings Instructions Eye # 1 closes at bias of about 40. To avoid serious and permanent tube damage when constructing an amplifier, always ensure the grid bias voltage is present at grids 1, 2 and 3 before applying B+ high voltages to the circuit. ), Pye SSB 130 (2x 6883B PA, solid state Mod. (Symbol " # " on roll chart) Set BIAS VOLTS at 40, press and hold down button indicated in the PRESS column while rotating BIAS VOLTS control until tube strikes. (c) A two range (0-10, 0-50) D. KT88 Digital Brain Electric Activity Mapping collects EEG signal with electrodes, via integrated amplification, A/D transformation, PC auto-analysis, FFT, to form electroencephalogram that displays with color depth. It seems to be a good tube for making a good amplifier with very good linearity. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. Click any Calculate button to see the recommended tube bias currents in milliamps. Guitar Fretboard Chart of All 5 CAGED Positions of the Dominant 7b9 (Flat Nine) Arpeggio on Full Neck Guitar Fretboard Diagrams. The KT88 / KT66 /6550 Directory. The signal from the guitar controls the flow of electrons through the valve causing a larger signal voltage to be developed at the anode of the valve. Nun mal meine Frage: Wie hoch stellt man am besten den BIAS für die KT88 ein?! Wie hoch stellt man am besten den BIAS für die KT88 ein?! Bei der EL34 hatte ich ca. Surface Type: asphalt TDZ-Elev: 3130 ft Lighting: Edge, ALS, Centerline, TDZ Stopway: 197 ft Runway: 21R Length x Width: 11125 ft x 148 ft Surface Type: asphalt TDZ-Elev: 3123 ft. Experimental 1 - Filament bias output tubes, Osram P2 should work and first attempt without cathode cap. The tube that has been popular for a long time is the EL84. BG157 - New series on how to build a KT88 Single Ended Amplifier. Cleaned pots, switches The date codes of the parts are from 1968 and 1969, although one of the websites says that the serial number is from 1970. Nov 22, 2019 - Explore Thomas Trout's board "Diy amps & layouts" on Pinterest. later i might try a 6sl7 im not very familiar with those. Designed for endurance and longevity for application in the audio industry. A future-proof design, PrimaLuna is compatible with NEW tube types not even thought of today! EVO 400 Integrated Features Comparison. For the tubes, I decided to use some KT88. For self-biasing. It has even less distortion and an even cleaner tone then the 6L6 or even the 6550. KT88KT88 labelled G. (8) KT88, (4) 12AX7A and (4) 12AT7 vacuum tubes. This is a comparison of 6L6 power tubes in a Fender Super Reverb Reissue. Bias refers to the adjustment (generally in the power tube section) that controls the voltage of the grid of a tube. A KT88 production line of a large factory is always automated. I set the English R7 Bias pot to the chart for 6L6. 5” deep and weighing 157 lbs each, plan your system layout accordingly. When the grid bias is properly set, the tubes are balanced in the circuit and produce a clean, powerful signal. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. Can test older non-key way tubes. Last Update: Description. When driven close to its maximum output, the bias will change several volts, becoming more negative by roughly four to six volts. 5, 1, 7 or 15 Watts of output, the Rocker 15 is an extremely portable combo that moves seamlessly from the home to the studio to the stage. Using KT88's, this amp is biased near class A and puts out around 25 watts. Matching also provides an additional quality check to help reduce the possibility of receiving a faulty power tube that may have slipped by the manufacturer. That journey above is certainly true for me not necessarilly owned a Leak Tube amp but hearing and owning similar items like Dynaco 70 Tube amps and Chinese made KT88 Tube amps plus others. Viewing the topic DC bias in transformer. One reader wanted to see how the Broskie auto-bias circuit could be used with power output tubes; above is a more fleshed-out version of the Broskie auto-bias circuit that would work well with a set of power tubes like the 6L6, EL34, KT88 or 2A3—or even a single output tube. Tube Bias Calculator Instructions & Help. KT88 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:35:29 PM. It was manufactured in the U. For example, EL34, 6550/KT88, maybe EL156 is enthusiastic choice, 8417 will be maniac, or I have four PL519 stock. OPT6 for SE 1. The KT88 also takes 50% more heater current, so depending on how close they toleranced the power transformer heater wiring, you may fry that too Plate dissipation on the KT88 is a lot higher than the 6L6. Chord and Arpeggio Symbol Chart. The other tube that would run without to many changes is the KT66, in fact the KT66 may sound better, compare the KT88 to a 300B and the KT66 to a 2A3 and you get the picture. Had it since 2003, modded by [email protected] in 2003 with Russian and aurie caps. Insert meter plug into bias jack. I am wondering what is the problem with using 220k since my current build uses a LARMAR Master which is just over 225k. 5 watts So, 24. Ritchie Blackmore was a famous user of the Major, but they were heavily modded at the Marshall factory (as said in an interview) and later by a man called John Dawk. 13 db total loop feedback is used. Jolida 302b, heavily modified. 95: Triode USA Dynaco Mk3 Tube DIY Amp Kit. Tubes were biased for best sound, with the bias settings ranging from 37 to 42. The KT88 is also suitable for use as a series tube in a stabilised power supply. 0: 12AX7, 6V6: 231: DIY Plasma-Tweeter: Looks better than the other one. Con poche misurazioni il programma calcola la corrente CORRETTA da impostare sull'amplificatore che sia marshall, fender, orange, fbt o autocostruito.