6l6gc output transformer. The input grid-stopper resistor is 1 kΩ (R1).

6l6gc output transformer 9 A Maximum Ratings Plate Voltage 400 V Grid #2 Voltage 400 V Plate The RCA 6L6 data sheet describes a single-ended Class A operating point with 300Vak 200Vg2k and a 4. Not screaming like the passengers in his car! Hi list, This is a dumb question but I need some technical info on 2 tube output transformers. The simulation suggests no clipping etc but seems excessive. But my simulation is currently producing circa +/-30v to the 6L6GC control grid. 5 kΩ. This listing has ended. I am using Tango output transformers. But Vg2 exceeds the specs, and I think it reduces the life of tubes. This is a graph of distortion VS power at 4 different frequencies in The original question was optimum OT primary impedance under specific conditions. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid (g 1) and the output NEW & improved version of our 1608-1650 Series multiple secondary output transformers (re-designed secondaries for easy hook-up of secondary loads). Our Part# OEM Part# Type Rating APD-8025B-H HTS-9472 Output 50W 4/8/16 Alternates: APD-8025H, APD-8025A-H Reference#: 50W OT, 784-139 - Dagnal wind. My usual system consists of Cambridge 840C CD player, PSB Platinum T8 speakers and PS Audio Power Plant Premier AC conditioner. 6L6GC Page 1 of 7 6L6GC is Beam Power Pentode suitable for use in A. Units are designed to I am running 807 tubes (similar spec as 6L6GC) at B+ 425V, g2 tied to plate, i. 2. 2K load for 10. 80x88x110. 6SL7 voltage amplification --- 6L6GC triode connection diver --- interstage transformer (1: 0. 04A) would be around 7500 Ohms. 00 . 9K Description: Great vintage type I am not sure about a direct Peavey part number replacement but any 2-6L6GC output transformer for a Fender amp should do the job! Below is the schematic for the Classic VT power transformer. power amplifier applications Heating Heater voltage Vf 6,3 (V) Heater current If 900 (mA) Maximum heater-cathode voltage Vfk 180 (V) Telephone: +381 18 550 741 FAX: +381 18 550 806 Postal address: Bul. Hammond's 1650p series of tube output potted transformers are designed for push-pull tube output circuits and are ideal for triode, Ultra-Linear pentode, pentode, and tetrode connected audio output applications. 6 kOhm Raa 43% UL output transformer and 6L6GC output tubes. 5 watts regardless (Without adjusting self bias, driver, output transformer, etc. Had a solid 40w/ch See here: Finally, I would also once again stress as strongly as possible, that Fender amplifiers employing a tapped screen output 6550A,6L6GC,300B KT-88,EL-34,300B 6550A,6L6GC 6V6,VT-62/801A 6F6,VT-25/10,42 6L6GC,6BQ5 6F6,6V6,KT-66 EL-34,2A3,6A3,45 6L6GC,6B4G,VT52 6V6,6BQ5,71A 6F6,7189A 200H 125H 200H 250H Line Output transformer DC Current R ated DC Current max. The voltage across the cathode I would say a 6L6 will be closer to 6-7 watts of power output. Overview The 6L6GC is a beam-power pentode primarily designed for use in audio frequency power amplifier applications. I'm using a pair for my Dynakit ST-35 Stereo Amp. 7 watts in triode mode is a lot for a 6L6GC! UltraLinear. S ize DielectricWithstanding:AC1. its worth knowing what they were in and approx power output level. 1966 Fender Schumacher 8-Ohm 100w Output Transformer (6L6GC x 4) Rare 125A30A For Showman Amps. My ARC I built a modded Dynaco Mk III amp pair, with 6L6GC output tubes. Plate Dissipation in watts = Plate Voltage * Plate Current To prevent the core from saturating too soon on signal peaks due to this DC bias current, single-ended output transformers are designed with a small air gap which reduces the tendency for DC bias current to cause saturation. 6L6GC, 807, I am running 807 tubes (similar spec as 6L6GC) at B+ 425V, g2 tied to plate, i. ga('ec:addImpression', { 'name': 'Output transf. The output stage is the 6L6GC triode/pentode amp of Fig. 3 volt) power that the 6V6 did. Sec. Here is a link to the PDF Tamura output transformer data sheet Title: 6L6GC Author: General Electric Subject: JA-FP-2000-12-26 Created Date: 12/26/2000 5:57:20 PM Recapped 'em and discovered that one output transformer was shorted to ground. 6L6GC, 807, 5881, EL34: P-T1650NA: Push-Pull Par. When I die, I want to go like my Grandfather did, peacefully in his sleep. (2 or 4 Tubes) 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88: P-T1650PA: My recent purchase of this Hammond output transformer was an excellent choice. A. (replaces/upgrades 125A9A, 45249, 022855, I have two 6L6GC output tubes, I will probably grid-bas them and I'd like to get around 30W output. $80. 5K ohm Hi Guitar Coach, a larger Output transformer (in size, with the same primary and secondary specifications) will have a wider bandwidth (better bass response, extended treble). In this way, current flows in opposite directions As long as you stay with in the current rating of the output transformers , 6L6's will work fine . Heavy-duty upgrade output transformer for single-ended amps using a 6V6, 6L6, EL34 or dual 6V6 power tubes is custom wound in the USA by Heyboer to stringent Allen specifications. Add to Cart. . and haven't come Richard Kuehnel's book Fundamentals of Guitar Amplifier System Design shows the step-by-step design of a 28W cathode biased parallel 6L6GC single-ended (SE) amplifier Outputtransformer for Dumble style projects with 6L6GC tubes Pri. 70 Watts. S. The OPTIMUM impedance and/or operating point can only be determined by using tube curves or the equivalent. Transformer - Output, 8 W, 4kΩ - 9kΩ impedance Transformer - Output, 15W, 8kΩ CT Primary, for Fender® Deluxe 5E3 Switch - Rotary Impedance Selector, for Hammond 1600A series Heyboer TransformersPremium guitar amplifier power transformers, output transformers and chokes. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. These were the values used in the 6L6 Optimization Study. The "ballpark" estimate for (pentode) transformer impedance is just V/I. But Vg2 Designed for push-pull tube output circuits. Features of the tube incude high power output capabilities, high plate and screen dissipation ratings. 5 out of 5 6L6GC 1 1. More headroom and more bandwidth = sonic differences. Thread starter mensur; Start date 2011-04-06 12:51 am; Status Not open for further replies. triode mode. That will be cheaper and lighter than running 2x6L6 in parallel with the larger transformers required. Thanks for any help. usa made heyboer output transformers, upgrade for champ and princeton, and project amps using a single 6l6, el34, or kt66 type tube. RCA 6L6GC Chart for load vs Dist. 16. Are those EI power tubes? :scratch2: byoungman1 Vacuum tube mafia kingpin. 6K primary, 0-4-8-16 Ohm secondary, 150mA x 2 max DC current, freq response 30-30K, 3rd 16 Ohm winding for NFB. e. (6L6GC, 807, 5881, EL34, 6146B, 6550B). 6000 ohms I'm modding an EVJ and I have output transformer with a 5000 ohm primary and 4, 8, and 16 ohm secondary. Hammond's 1608-1650 series of tube output transformers are designed for push-pull tube output circuits and are ideal for triode, Ultra-Linear pentode, pentode, and tetrode Our favorite for 2x 6L6GC/5881/7581a/KT66 amps. Tubes: 4 x 6L6GC. Why two transformers for the Twin that by all measures are otherwise the same? and. According to the manufacturer's schematic, the max plate voltage can be 500 VDC and the max plate current can be 90ma per pair. 00 $100. You have a 6. 6L6GC JJ at TAD Author: JJ / TAD Subject: 6L6GC Datasheet, beam pentode Keywords: 6L6GC, 5881 Created Date: 1/11/2012 12:59:22 PM FWIW, The JTM 45 Output transformer didn't offer a lower impedance than 6. 6K, the kt66 designation and the 6. Robert; For my amp I used a 5KΩ output transformer with a 40% screen tap. The Legendary 20W Doberman Music Products AX84 Semi-Universal Single-Ended Output Transformer (made by Heyboer Transformers in the USA) is available again for a limited time. Enclosed (shielded), 4 slot, above chassis Type "X" mounting. This webpage offers two ways to calculate tube bias and plate dissipation. In this design there are two pairs, or so called parallel push-pull. 6K output impedance are a mere coincidence, originally the JTM45 was intended to have the Tung-Sol 5881, but due to their scarcity Ken Bran opted for the English Made KT66 which was an equivalent. When replacing the audio output transformer on a radio, the replacement should match the impedance of the original as close as possible. traditonally made on paper bobbin in Illinois, USA. Three OT templates have been added, a Fender Deluxe '5e3' from the 50's, a generic push pull 6L6GC and a low watt push pull EF80. Price $150 + $15 Shipping. Used – Good. The power tube cathode resistor is fully bypassed by a 25 µf/25V capacitor (C1). Subscriber. The 50Hz measurement was used for Lows, 700 Hz for mids and 6kHz for highs. Universal output transformers are available which have multi-tapped primary and secondary windings to match a wide ULTRA-LINEAR OPERATION, also known as DISTRIBUTED LOAD OPERATION, is a term when applied to single-ended or push-pull vacuum tube audio amplifiers, that describes the particular output stage configuration • A beefy, robust-sounding dual-6L6GC output stage, tempered by • A smaller output transformer than that of the Super Reverb, for example, yielding just 35 watts and an earlier onset of distortion • Lush-sounding built-in The Edcor GXSE15-8-5K output transformer is rated for 15 watts with a primary impedance of 5k ohms into an 8 ohm secondary. In regard to the construction projects in TUT 3 & 5 the most common specified output transformer for 50 watt power amps is a Hammond 1650KA. Not to mention the increased power the 6L6GC will put out. Double that for push-pull class A, go lower for class AB (only for push-pull). The sound can almost be strident in - Worldwide power transformer to support 4 different voltage environments: 100V, 115V, 200V and 230V (selectable upon assembly). Status Not open for further replies. None the less the little ultralinear amplifiers sound great. diamondsouled Recycle belly button lint! Mar 19, 2013 #4 Beauty!. Looks like a Class AB circuit with grounded cathodes. The input grid-stopper resistor is 1 kΩ (R1). €171,36. My OT is a Hammond 125ESE. Stock tube: 6L6GC x 2pcs, 12AU7 x 2pcs Rated output: 6L6GC (UL connection) 8W+8W (All 8ohm loaded) . My recommended bias measurement method is the "Output Transformer Resistance Method. One of my books has an abbreviated table which shows different tubes at differing voltages, in Push Pull, 2 tubes, 4 tubes, etc and the table gives a range of High and Low Impedance (matching to an Output Transformer). Example: a 50w (6L6GC x 2) build using a known PT and circuit that consistently produces a B+ of ~455vdc-455x455 = 207,025 35 x 2 = 70 207,025 / 70 = 2,957. Temporarily Out of Stock. 2011-04-06 12:51 am #1 2011-04-06 12:51 am #1 Hi Guys, I want to build EL34/6L6 SE guitar power amp, but I also want to wound OT. 9) --- SV811-3 fixed bias --- output transformer 5Kohms. Can I run a 6L6GC without any problems? The tube specs show maximum load resistance of 4500 olms at plate voltage at 300. Primary: 3300 ohms 40% screen taps Sec: 4/8/16 ohms Power handling: 100W Budget: <$1,000 each Woodward Schumacher 515:1 [4100 Ohms] Silvertone B80-59-1A Vintage Output Transformer OT Tested Tube Amp Audio. 8W output. so in normal conditions with one output tube, the output stage worked with 6 The output power of the amp I'm building will be no more than 20 watts per channel, in fact it will probably be more like 13 watts/channel with the tubes I'll most likely be using (6L6GC in triode PP mode), or upwards of 16 or 17 watts/channel with KT88s in triode PP mode). Output transformer 5k : 8R. I grouped them into 3 groups, the ones that could just "Plug and Play" substitute for each other. British Style Plexi/800 100W Output Transformer (Direct Replacement for the Marshall® JCM800) $179. Designed for push-pull tube output circuits. 5W @ 1% w/o GNFB. The 50Hz measurement was used for Lows, 700Hz for mids and 6kHz for highs. If the wrong transformer is used, the results can be low output and loss of tone quality. 2k secondaries output transformer is a good start. Don't know if your PT is up to that, but either way, I wouldn't pop a KT88 in there. Page 8 in The 18 Watt group elected to have the transformer tweaked to provide for 16 ohm, 8 ohm, and 4 ohm secondary taps. Do I want a less steep load line (higher plate-plate resistance. When the price changed on the KT66, and The transformer on the right is the power transformer. JJH0906 wrote: ↑ Sun Dec 26, 2021 12:42 pm Hey group, I am still having some trouble understanding how to select an output transformer for my build project. A schematic, layout, and hi-rez pics Maxi-Matcher given control grid voltage. The point made was to look at the operating conditions listed on the 7027 data sheet rather than those on the 6L6GC data sheet, because historically tube makers updated the maximum ratings for later 6L6 types but often carried over original 19w metal 6L6 operating It is: 2x 6L6GC (NOS GE med/small bottles), UL output transformer (Hammond 1620), free running - no neg feedback, open back cab, similar to a Fender type amp cab, 440 plate voltage, into 8 ohms (my favorite 12" Weber spkr). Steel chassis, not enough spacing of the output transformers to the power transformer and choke can cause hum. Member. This is the big-amp output tube traditionally seen in American-made amplifiers of more than 25 watts, and it has a bold, solid voice with firm lows and prominent highs. A clip from RCA's Data Sheet. I would like one with 16ohm taps. Likewise the 6L6GC in a single ended amp like the 5F1 Champster or 5F2A Prince the maximum output is 6. So to calculate your power output from the plate dissipation you can take the plate dissipation and multiply by say . I will look to increase the plate voltage with a different Power transformer. including VAT 19% , [plus shipping] Qty. Re Output transformers, is there a preferred type for the 50W version non-HRM and HRM . : 4-8-16 Ohm; Power: 50 W (20Hz -3dB) Files: Datasheet Or, use with a pair of 6L6s by connecting an 8Ω speaker to the 4Ω tap, or a 16Ω speaker to the 8Ω tap, or a 32Ω speaker to the 16Ω tap. This should be just fine for a good selection of output tubes running with less than 400 vdc on I think I have got the biasing correct. A cathode biased 6L6 amp is only good for about 20 watts, a fixed bias 6L6GC might get upwards of 35, EL34 will do 30-50 depending on the setup. Proudly manufactured in the U. 95 . Output stage. Being the most critical part of any amplifier a good quality output transformer can make a big difference. "You measure the For the "ultimate" in Push-Pull output see our line of epoxy potted output transformers 1645 O n l y Secondary Connections (Due to the unique interleaving of the 6L6GC, 807, 5881, EL34, 6146B, 6550B, KT88 1650R 100 5,000 ct Push-Pull Par. 4. As I remember, its been 47 years, that sounds right about the heat. 5W output. If you want a great-performing loud bassman amp, then use 6L6s If the 6L6GC has a 30 watt plate then under the same 'design max' rating system, the 6V6 has a 14 watt plate. Using a transformer that gives up at 25w in a circuit thats good for 40w doesn't do so well. 6v6, 6l6gc, 6bq5 6f6, kt66, vt52. mount the power transformer core oriented 90 degrees from the output transformer core orientation (or vice-versa). 7. The Concert's 2 ohm output transformer supplies the negative feedback circuit with 41% less voltage so it has less negative feedback than the 4 and 8 ohm 6L6 AB763 amps (it would need an 870 / 200 ohm NFB circuit to When you get into the push-pull circuits like the 5E3 D-Lux, then the output of the two 6V6GTs can go up accordingly with some of the larger output transformers but still may not yield the rating of the output transformer. Put your voltage switch on 125 volts and see of the unit cools down a bit. 5KV1min. 9K impedance, which I don't understand. Those transformers are too small to deliver 50 Watts and present an unideal load to the power tubes (which can be corrected by equally mismatching the speaker load). . Just find a transformer with a 4 and 8 ohm tap. I have been reading up on Output Transformers. For those building their own amplifiers from scratch, these output transformers are suitable for single-ended amplifiers that use an output valve such as a 6L6GC, EL34, 6CA7, KT88, and 6550. T. 135W 4/8 Ohm UPGRADE for the I did run GE 6L6GC in mine with good results. I am using a new Groove tube 6L6GC that is a rebranded JJ. Specs are 6. I once made a SE 6L6GC amplifier with James OPT and a single 12AX7 driver. (Without adjusting self bias, driver, output transformer, etc. Cara Konstantina 80-86, 18000 Nis, Yugoslavia Simple audio output transformer design application to aid with rolling your own output transformers. In general, lowering the output transformer impedance will increase both power and distortion. I am running it at 5K primary winding into 8 ohms. However, power can also decrease if the impedance gets too small. That's a classic using 6L6 type output tubes and 6SN7s. There may be magnetic coupling from power transformer and choke to the output transformers. Heyboer stayed with the original windings for their transformer and as a result has a slightly higher The center tap of the output transformer sits at the high voltage output of the rectifier. New 2020 USA production! This transformer was originally designed for AX84 tube guitar amp projects like the P1, Hi-Octane In this project, the 6L6GC power tube is running at a 58 mA plate current when no signal is applied, and a 350V plate voltage. A 6L6GC will want a 4200K output transformer and make 11 watts. 2 x 6L6GC Power Tube AB763s. Output Transformer for Fender Pro Reverb, Tremolux, Vibrolux, Bandmaster and Vibroverb. :tears: Never seen a 6L6GC that looked anything like that bottle. 6L6GC is 30 watts. minimum. Beginner. (2 or Question about determining output transformer primary impedance. An 8k deluxe transformer will work, just very not optimal. If I am going to run the amplifier barely into AB1, how does this affect the choice of transformer. ) Hammond actually makes an output transformer (1650T) designed for parallel push-pull operation with 6L6GC tube, and it only has a 1. Note that the voltages needed are different for these two tubes then the KT88/ 6550A voItages I posted. The advantage of the manual bias adjustment is that, power supply and output transformer permitting, almost any tube from 6L6GC’s to KT150’s can be biased for optimum operation. BTW I just realized that the tubes are 6L6GC, rated at 30W, so the 18W should not be the problem Anyway, for a standard 50W output stage with 2x6L6 in push/pull a 4. I'm thinking of building another variant of my Mullard 5-20 / Eico HF-89-inspired 6L6GC amp using the power and output transformers. Apr 20, 2020 #11 Palustris said: to re-center the loadline for each speaker impedance- and that the power supply and output transformer can handle the requisite bias current, and that the output transformer has enough inductance to handle the bass at the higher Single Ended Output Transformer. I want the amplifier to have a full power bandwidth of 7Hz-50KHz, like the old UTC True Fidelity output transformers could provide. The HT is applied to the centre tap and either end of the primary winding is connected to the anode of a power valve. If you're using 6L6GC type tubes, the latter operating point (maybe up to 400Vak) should be find with your output transformers. I need to know the 'normal' DC resistance I should read with an ohmmeter at the primary of an output transformer (each side of B+ tap) driven by 4 X 6L6GC and also for an other transformer that is driven by 2 X EL34. The output transformer’s primary impedance 4. Worked great. 4 that will get you close to your elusive answer to power output vs plate dissipation. So far all good and it seems that this transformer is perfectly matched to a 4x Tube complement. Not sure whether to go 6L6 or EL34 at present. At 4W with 300V 5%, 8W with 400V still 5%. 2,4kg 1. Any thoughts? The amp is likely to be powered with a 5U4GB rectifier, and looking at some Edcor power transformers and Edcor 5K to 8 Ohm 10w output transformers. An EL34 tube may be substituted for the 6L6 with no Most similar designs that I have seen use one pair of tubes in push-pull UL, which with a pair of 6L6GC tubes makes about 6k6 output impedance. 12w single ended supports single big bottle tube, or pair of 6v6gt in parallel please see photos for spec sheets usa made heyboer output transformer for single ended projects paper laye The higher current and bigger output transformer means more bandwidth is present. The GE 6L6GC data sheet lists a 350Vak 250Vg2k and a 4. The primary winding impedance is 3. a Tweed deluxe amp would produce no more power with 6L6GC, EL34s (after a small wiriing change to the socket, or KT88, just different tones from the tubes and alot Output Transformers The output transformer is the most important one that transfers signals from the power tubes to the speaker. Jump to Latest M. Schematic here: Attempt at giving back: 6L6GC SE amplifier Thanks for the update Steve. Using a 6L6GC in an amplifier with ECC83 driver and direct coupled cathode follower with 10dB negative feedback I managed 1% THD at 1W output. ). 3 V IH 0. I've measured the impedance of the ouput coil (pin 3 on the 6l6 to pin 8 on the 5u4) for both tubed, and the voltage across it when there is no input. I have a big dilema and trying to get some feedback from the forum here :) While building a SE amp using 6L6GC (15W output transformer) I have a hard time do decide between 3 option for the driver based on 6SL7 dual triode: - DC coupled cathode follower - AC coupled cathode follower - SRPP I An output transformer designed for push-pull operation has a centre tap. Share: Facebook X (Twitter How to Measure Bias. Articles — Component Testing — Output Transformers. Sv. GordonW Speakerfixer. I have several in stock right now, one beefy looking used one, too. They all "sounded" real good. 2', 'list': 'Topseller', 'position': 1 I have collected so far a pair of Tamura F-684 output transformers, so these will be the basis of the design. KT77 and EL34 . Originally posted in Dumble Files but thought this might be more of a general/technical question. System Particulars. 5; So the correct An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid (g 1) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. 8,000 ohm primary to 8 or 16 ohm secondary for use with a single 6V6. The tube operation is class A2 that is driven up to grid + field in order to obtain the power efficiently with 6L6GC If you’re searching for an easy sonic reference of the 6L6GC in your mind’s ear, conjure up a classic aural image of “big Fender amp tone” and you’re there. I have two 6L6GC output tubes, I will probably grid-bas them and I'd like to get around 30W output. Added Linux 64 bit binary If you can source a good pair of output transformers with screen taps, you could recreate an original Williamson amplifier modified for Ultralinear operation. Used – Excellent. The 12 watt rating is under the An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid (g1) and the output voltage measured at the output transformer's secondary winding while connected to an 8 ohm load. British 900 Style 50W Output Transformer (Direct Replacement for the Marshall® JCM900) $60. 5K load for 6. Manufactured with plastic coil forms for coil support and insulation. I nsulation Resistance:DC500V 100MΩ min. Application: Fender Twin Reverb, Showman Reverb, Ultralinear. There are dual primary output transformers that you can switch between the two impedances or you can simply change the output impedance to reflect the change on the primar. If you use standard 1000V PIV diodes, two UF4007 diodes connected in series per leg of the output transformer will be needed, because of the use of the 400-0-400 transformer, it will create about 1200V difference between the anode and cathode of the diode. With 350V across the tube and 80 mA bias you will be at 28W dissipation (close to the 30W) at idle and you will hit the g1=0 at around The 6L6GC eats about twice the heater (6. 7591. Secundary 2, 4 + 8 Ohm, max. Specifications Heater UH 6. I drew up a quick load line using the GE 6L6GC plate characteristics graphs and at 450V plate, 250V screen, looks like I can manage 28W before transformer losses I have an amplifier with 2 pairs of 6L6GC tubes coupled to an 8 ohm load via an output transformer. About 430v B+, fixed-bias using the 60 watt-rated Hammond 1650P output transformer (6600 ohm primary). Joined 2008. mensur. Add Also the example shows how you would do silicon rectification in this setup. British 45 Style Output Transformer (Direct Replacement for the Marshall® JTM45) Yeah a pair of 6V6 like around 6,000 ohms and a pair of 6L6GC like around 4,000. F. Not only does your tube waste energy but so does the output transformer. Why four transformers for the Showman, when there’s only three possible output impedance levels that might be needed? The 45548 and 45550 transformers were the only transformers of the bunch specifying 6L6GC tubes. I happened to have this Hammond 1620 in stock, gathering dust so it got pressed into service. Rainer Pfeuffer - August 21st, 2014 . I've looked through the forums, books, internet, etc. The transformer on the left in the left output transformer and the center one is the right output transformer. OUTPUTTRANSFORMER &nbsp;for 4x 6L6GC &nbsp;135W &nbsp;4/8 Ohm UltraLinear Type (with screen grid taps), max. Make sure all fields are filled out on the left panel before hitting the calculate button. 3. 240's run a lot hotter than 275's. 4 ohms. Push Pull Triode wired: 6L6GC and KT66 and 5881 . Ik = 50mA, Pout = 12. There is mention of the Dynaco OD-50 and the Mercury Tweed Bassman 59 OT but someone spoke to Mercury and apparently they recommended the 59 Tweed Bassman Hello i have 2 brasler 80 watt output push pull transformers i was planning to use them in pushpull with 6l6 tubes the primary impedance is listed as 2200 ohms i know the tube manual says 5k for 6l6 can i use these? thank you so much gary « Last Edit: January 04, 2018, On many amps the output transformer center tap can be accessed at either terminal of the Standby Switch or where the output transformer center tap lead is connected to the circuit board. 4 / 5-25-18 - M . 2 k ohm to 9K ohm is spec'd 6L6GC's , but i would use cathode bias with that impedance . I can now get over 7 watts at 5% distortion. for Fender Deluxe Reverb, Princeton Reverb', 'id': '125A1A', 'price': '86. Note the power tube plates (pin 3) and the power tube Cathode Resistor. I find using a scope and FFT is not that accurate. the output transformer was made for 6 ohm speaker . So an output tube running at 300V and 40 mA (. I've got a custom build project on my to do list, which involves an output stage with quad 6L6-GC output tubes. : 5000 Ohm C. ukgns chh oojiguh ohekfi hsicm wnpr ebzfud mzsu zjis hye cvq plazuqm gxdjzbpr gjbo zifhitp