6aq5 output transformer impedance. As more tubes become available we will add them .

6aq5 output transformer impedance The only notable changes will be The function of the audio output transformer is to transform the high impedance of the output tube to match the much lower impedance of the speaker. Jun 27, 2017 · The 6V6 / 6AQ5 schematic is only basically similar to the 5902 schematic but the 5902 B+ and bias point is much lower. Most designs use 2x the triode's rp to get the most power out possible, but that will be at higher THD for a given circuit. They have a separate set of "single ended" transformers (125SE). If you square the voltage rating (70. I planned to use these tubes plus a Sylvania USA 12AX7. 15kΩ in parallel with anything will be equal to or less than 15kΩ, which is lower than the typical ~39kΩ output impedance of a typical 12AX7 stage. Apr 8, 2016 · Part Number: 1609 Output transformer, push-pull, 10W , primary 10,000 ct, 100 ma. IWISTAO 23W Tube Amplifier Output Transformer 1 Pair Pull-Push Z11 Silicon Steel with Shield Cover for Tube 6P1 6P6P 6P14 FU29 6AQ5 6F6. An output transformer designed for push-pull operation has a centre tap. The optimum impdeance depends on the B+ supply voltage and whether the tube is triode-connected or not. Question leave the radio as is or change the speaker to an 8 ohm unit? Apr 8, 2016 · Part Number: 1615 Output transformer, push-pull, 15W , primary 5,000 ct, 100 ma. Mar 11, 2010 · the smaller the cap the more AC impedance to ground at low frequencies, so it ends up dropping the gain. Here's some information from the Hammond site: Hammond 125J Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. Values vary with transformer capacity, with high-voltage transformers typically around 10%. 5 watt heater that has far greater emission than the 6AQ5. Or Triode connected push pull would be sweet for sure! The Handbook modulator article discusses the range of output power from four 1625 tubes in Class AB1 at various supply voltages, 140 watts of audio being available with a 750 volt supply. Apr 8, 2016 · Part Number: 1608A Output transformer, push-pull, 10W , primary 8,000 ct, 100 ma. The frequency response is approximately 100 Hz to 40KHz as determined by measurements during testing. 1 & 0. Some sort of a seven pin single triode driving a 6AQ5, with a 6X4 rectifier tube, or a SS bridge power supply. It simply reflects the impedance load on the secondary back to the primary. I once built a PP 300B amp using 6. Phil Mar 27, 2018 · I think that Triad Transformers N-68X would be a great thing to make that amp with, they are cheap here in Europe and cost only about 15$, they are a 1:1 rato transformer with 1x primary and 2x secondary in one to one ratio output each, so I think that there maybe is a way of connecting that transformer in series to get a 1:2 ratio PT that would put out about 230V. Secondary approx 4 ohms. If the wrong transformer is used, the results can be low output and loss of tone quality. , secondary 4-8-16 Apr 30, 2025 · I understand that the primary impedance of the OPT (for a desired speaker load) sets the voltage-current slope of the load line, and determines output power and distortion. When used to couple a lower plate impedance, the reflected secondary impedance "will be proportionately lower. As the output Voltage rises, especially at high power, a tranny without sufficient Inductance at bass frequencies can easily saturate creating intense distortion. 35 audio annealed silicon steel sheet and high temperature resistant oxygen-free copper wire with 4+3 HIFI winding method. The load is usually a loudspeaker, for much of the program spectrum the speaker impedance is higher than nominal. 6K resistor across the 6AQ5 plate circuits act as a snubber which absorbs super-sonic signals instead of sending that energy to the output transformer. 58 LS. It should have lower screen current under these conditions, and the datasheets typically recommend a lower primary impedance for the output transformer. ) to run quite hot - after all they are dissipating the same heat that used to be dissipated in a large octal tube! I couldn't find a . 3V 300mA power transformer. 000 -50,000 7-50. I have a nice 8 watt transformer (Hammond 125J), but the primary is center-tapped and the description says it's for use with "push pull" circuits. Apr 3, 2010 · For the output transformer then, the primary must be wired blue to plate and brown to B+, ok, got it. you're running 6AQ5 output tubes in an amp that, according to the front panel, is designed to run KT88s?? Did you modify the circuit in some way? I'm not real familiar with the KT88 / 6550 but the load requirements of the two tubes (output transformer primary impedance) seem quite different. 61 LS-63 LS-6L1 L S-GS s-666 Type . Valve (tube) diodes have the inevitable nostalgia value, but they are Typical applications - Push-Pull: triode, Ultra-Linear pentode, and tetrode connected audio output. Output transformer in the FM receiver is a 240 to 6. Causing arc-over in the transformer windings or inside the tube? Or is this an The Gibson GA-5 was created in 1954 as a low-power practice amp to accompany the Les Paul Junior guitar. Model No: WVTTPP-OPTPP23W. Jul 19, 2012 · Hi, I'd like to build a tube guitar amp with a single-ended output stage. 2 ohm speaker on the 8 ohm secondary will reduce the input impedance closer to the 3k ohms of the original transformer. Hello from England. Another part Zenith/part my-own design based on the power amp section of an SFD2530 radio/phonograph set. I have a 9k primary z output from a hifi amp that originally used ECL86's in push-pull that might be a better match than the one I was using, hoping to try it when I get it back together. This amplifier poses some interesting challenges in design This should also work. Today it is a highly regarded studio amplifier. May 13, 2024 · Master the method of how to calculate impedance of transformer with our easy-to-follow guide and ensure your electrical systems operate efficiently. I tried a few output transformers but just didn’t sound right plus there was very little room with the original ot’s being tiny. 2 ohm 100mA 10Hz - 20KHz 6BQ5, 6AQ5, EL84 6V6, SV83 Mar 12, 2010 · It will also require a output step down transformer to match the output impedance to the impedance of a speaker. Feb 1, 2015 · The H-20-7U output transformer is called the universal type because it's designed to be able to used for either 5K or 7K Ohms primary impedance. I would like to build a small push-pull power-amp with 12AX7 predrivers, and I'm hoping for some recommends for top performing circuits to base from (either 6AQ5 or 6V6 moderately driven). They were about 4300 ohm and sound great! An output transformer has no impedance by itself (ignoring primary inductance/resistance for the moment, which is a different subject). So far, I have two A transformer that is designed to generate an output voltage that is higher than the input voltage is called a step-up transformer. Jan 1, 2025 · Looking for an output txf for a late '60s Zenith, one of the following part numbers or equivalent: Zenith 95-2144 Merit A-3026 Stancor A-3309 Thordarson 22S24 Triad S-6Z Single ended txf The primary has a 5000 ohm impedance, approx 350 ohms DC. If the transformer came from an old radio, it likely fed a 3. 7. Click to expand Thanks for the reply. One transformer has a short orange wire (photos #4, 5). Figuring 14K into 8 ohms, this is a little higher than the10K ohm load desired by the 6K6 or 6G6, but this just reduces power output by about 20%, and slightly increases distortion. Feb 26, 2022 · Hello Guest, Please feel free to join us! There are many more parts of the Phorum that only members can see. 5" footprint Jun 8, 2016 · If I know that a tube at a certain B+ voltage is happy with a certain Output Transformer impedance (Z) and I want to use 2 tubes in parallel (same kind of tubes or tubes that at the same voltage are happy with same Z) * For three-phase transformers, use 1/3 of the three-phase KVA rating, and enter table with rated line-to-line voltages. I have a push-pull amp schematic that calls for an output transformer with 4K ohm primary and an 8 ohm output. This can be determined by measuring the winding ratio. The working load from a reverb tank isn't going to tax that driver circuit. Oct 24, 2025 · Item description from the seller Details： Model number: 6F2+6AQ5 Output power: 10W x 2 Output impedance: 8, 4 ohms Frequency response: 28HZ-20KHZ Tube model: 6F2（6U8、ECF82）×2 6AQ5（ 6005、6095、EL90）×4 Single Ended 6BQ5/EL84 Stereo Amplifier. 2 ohm speaker. The power transformer can be used as a 120V secondary but it also has two primaries for 240V. The transformer is a 100 Va isolation transformer. See photos for details. , the use of Japan's imported Z11 core (EI48X17), with a pure copper wire triple-clamped two multi-layer winding, can be connected to the linear and ultra-linear connection method, low DC resistance. The radio worked well for what Dec 22, 2020 · You need to drop the load impedance, which will give higher power and higher distortion, or go to a UL or Tetrode mode if you want more. It will work with most common output tubes. Obtaining the best performance involves very careful design of the transformers, and an idea that "seemed like a good idea at the time" can cause major problems in use. I'd probably try the 6AQ5 in both triode and, for more power, pentode with local NFB. Dec 12, 2023 · What is important is winding ratio, which determines impedance. Or, go to a parallel 6V6 output stage at half the load impedance for an easy way to double the power. Oct 29, 2024 · Transformer impedance is a critical parameter in the design and operation of electrical power systems. SPECIFICATION: Output power Turn Ratio Ultra Linear tap Primary impedance Primary DC resistance Output impedance Output DC resistance Max DC plate current Frequency response Suggest Tubes 10 Watt 33:1 40% 8. As more tubes become available we will add them Jun 26, 2020 · Well, with triodes in the output stage, using a higher load impedance reduces THD but also reduces output power. This article should be read first to understand the improvements described here. voltage swings. That gapped transformer with DC flowing through it is a big part of the "Neve sound", which generally isn't considered to be low-distortion. 56 HIGH LEVEL MATCHING TRANSFORMERS Application High level line matching High level line matching Primary Impedance 50, 125/150, 200/250, 333 500/600 ohms db from 10-40,000 10-40. and I know the 6P15P is way more of a 6bq5 Transformer Impedance calculator: Just enter the injected voltage/short circuit voltage in volts and the rated primary voltage in volts then press the calculate button to get the transformer impedance in percentage. 5. Are they being run in pentode or triode? What rectifier was used originally? If it works Transformer percent impedance The question of transformer impedance often comes up during an engineering evaluation. 5K transformer sound right for this use? Look what happened to the Model T Radio - It's gone Push-Pull! Modified radio now provides slightly over 5W output. 0 (Ubuntu) Sep 7, 2024 · Both have a 7. The circuit is almost identical to the Fender Champ 5C1 and uses the same tubes: a 5Y3 full-wave rectifier, a 6V6/6AQ5 beam power tetrode, and a 6SJ7 sharp-cutoff pentode. 6SJ7 Preamp Here is the preamp circuit. View results and find 6aq5 tube datasheets and circuit and application notes in pdf format. Determining Output Transformer Impedance When replacing the audio output transformer on a radio, the replacement should match the impedance of the original as close as possible. I've toyed with the idea of trying something similar using the 6AQ5 driven by a 3A5, which is a 7 pin dual DHT. This was used for mains isolation as the receiver has a live chassis. 5K impedance for 25/35/50L6 and the miniature and loktal equivalents (and 6V equivalents like 6W6, 6AS5 that also use 100-150V B+) and 5K to 7K for 6V6, 6F6, 41, 42, 6K6, 6AQ5, 6BQ5 that use 200-300V B+. Nov 8, 2025 · 5K SE AUDIO OUTPUT TRANSFORMERS (pair) FOR ,6V6 6AQ5 6E6 6E5 6BQ5 7189 42 43 Nov 30, 2004 · a 3 Watt output transformer with a 2K primary and an 8 Ohm secondary. Adding some additional info: the output txf for an AA5 radio would also work, as long as it can fit in a 1. But the output impedance of a tube stage can be approximated fairly close as internal plate resistance in parallel with the plate load resistor (rp || Rp). ) Table (b) requires definitions of transformer classes: Dec 7, 2009 · Valve amplifiers pose special challenges for the output transformer and power supply. The 1nF capacitor and 5. Jul 6, 2014 · Yes, the transformer impedance should be at least somewhat close to the recommended value. 000 7-50,000 7-50,000 Secondary Impedance 1. , secondary 4-8-16 Transformer impedance, combining resistance and reactance, is crucial for determining safe current limits and ensuring efficient operation. But output transformers are made for two tube groups - 2K to 2. Nov 29, 2024 · Then regular 6aq5 circuit and set the bias. 5, 10 The primary impedance is 9100 ohms and the secondary impedance is 8 ohms. The output transformer matches the high impedance of the tube to the low impedance of the speaker, allowing for efficient transfer of power. I also used 470uF bypass caps on the 6v6 cathodes The 30W toroidal single ended output transformers are commonly used in the high end audio products. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. Interstage Transformers, type 930 to 938, may be used where higher or lower primary impedances are called for. A 2,000 Ω resistor would be suitable for a secondary impedance of about 15 Ω. It uses toroidal core with air gaps to improve the audio quality. Oct 23, 2007 · I built a six 6AQ5 amp, not a wreck though. You are correct that I over-indulged with the output transformer model, since a Hammond 125CSE would do just fine, but I wanted the enclosed type since it is meant to be exposed and the 125CSE as far as I can tell is an open-bracket type. Sep 11, 2019 · You've got high output impedance in many cases, a gapped transformer with DC flowing through it, and no distortion cancellation. Also included is information on UL and NEMA Dec 9, 2024 · Our online calculator tool allows you to quickly determine transformer impedance. Before the zeners were added I was having a tough time finding six tubes that were reasonably close, I smoked a few! I used onetics iron, I believe his AC-30 power transformer, high def output, and a big choke. They came out of a stereo amplifier using a single ended 6AQ5's, They will work with many other tubes including 6V6, 6BQ5, 8AQ5, 6BM8 and many others. 0K ohm 128 ohm 4 & 8 ohm 0. The transformer used in the 6x2 receiver is a high quality S-14 universal output transformer made by United Transformer. I have built the lacewood V1 exactly as specified with the exception of using the 370 series transformer for UK voltage and also Edcor 15-8-5 OP transformers rather than 10w as I had them from a different project. I'm running about 350v on the plates and lowered the screens with individual 75v zeners, as per my friends suggestion. Feb 24, 2006 · Re: Stand Alone Reverb Output Transformer by didit » Fri Feb 07, 2014 7:18 pm I'd recommend using your 125 and not overthinking this. Jan 23, 2020 · The principles and calculations are basically the same for a push pull stage as it is for an SE stage, so everything described in the Impedance matching of loudspeakers to output valves article are valid for any transformer, but there are other concerns to be taken when calculating a push-pull transformer. 18. A 6AQ5 running below 150V is cruising. Firstly, thanks for the website and the various amp designs, really appreciate the designs and all the info. A conventional speaker transformer of around 15K primary impedance can be used, but the 1000pF in the feedback network may need to be altered for correct frequency response. Now I know I could use different (better) valves and transformers, but the fun is to try and use these to make an acceptable stereo amp. NFB can correct for that to some degree but a lot of its going to depend on whether the output transformer can even work at that low of a frequency. For our NEW improved "easy hook-up" secondary series - see our 1608-1650 "A" series. An important application of step-up transformers is greatly increasing the voltage generated by a power plant so that the electrical energy can be efficiently transferred over long distances. This is necessary to get an efficient transfer of the audio signal to the speaker. It is normal for the 7-pin power tubes (6AQ5, 6AS5, 6BF5, 50C5, etc. In this comprehensive guide, we will delve into the intricacies of transformer impedance, exploring its fundamental concepts, calculation methods, and practical The 6AQ5 pentodes are wired in a push-pull configuration and drive the output transformer, a P-T291 standard replacement type. A transformer that generates an output voltage that is lower than the Two stages of gain, both common cathode with grid-leak biasing, followed by a third stage of cathode follower which provides a lower, improved output impedance to drive the final stage which is a beam-power pentode that drives a speaker through a audio transformer. Not sure if either are any good yet, but assuming they are for the moment, I'm thinking about using this chassis to somewhat 're-purpose' it as a simple push-pull stereo amp using four 6AQ5 output tubes. I had an idea to tear apart an old se 6BM8 Lafayette receiver I had and use this ot’s. The 5902 also uses a different (4k impedance) output transformer. , secondary 4-8-16 Mar 28, 2022 · Wait . 5K than the secondary output of 4,8 ohms, suitable for 6AQ5 6P1 6P14 6P15 6V6 6P6P 6P3P EL84 6F3, etc. In Richard Kuehnel's book "Guitar Amplifier Power Amps", I've read that when you set up N tubes in parallel in such a configuration, you get N times the plate current flowing into the o/p trafo and thus N times the power More often than not we will be trying to pair up a power transformer and output transformer that have been scrounged, so this tutorial will outline the more simple method of designed a push-pull stage using load lines without the rigmarole of drawing composite characteristics. 2. The 6AQ5 is based on the 6V6GT. , secondary 4-8-16 May 11, 2025 · I'm really digging the little, common, dirt cheap, "6V6 equivalent" 6AQ5 7-pin peanut. " You measure the output transformer's voltage drop and resistance to calculate the bias current. Also rated Aug 30, 2018 · For a PP pentode stage I like to set the load impedance lower than that which generates the largest output, up into the knee of the plate family. Understanding its complexities is essential for engineers to ensure optimal transformer performance and system stability. My recommended bias measurement method is the " Output Transformer Resistance Method. 5. Transformer Unlike power transformers, which operate exclusively at 50 or 60Hz frequency from the wall, output transformers, line-stage, and other transformers used for impedance matching must operate under all expected frequencies. Dec 22, 2007 · The output transformer will be a 10W line-to-speaker transformer. Aug 30, 2018 · This allows about 4 watts of power from the $5 70 volt line transformer used as an OPT. The inverted L network at the Nov 18, 2020 · The transformer positive sequence impedance is also called the short circuit impedance (because it is measured from a short circuit test) or the impedance voltage (because a voltage is measured from the short circuit test - more details below). Product Brief Output Power: 30W Impedance: 5K Max DC Current: 150mA Suggest Tubes: 6AQ5, 6V6, 6L6, 807, 5881, 6550, EL84 Weight: 6Lb LS. We would like to show you a description here but the site won’t allow us. 5x1. The nice thing about this circuit, is that it seems to get "big" sound out of even "little" output transformers. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. OUTPUT TRANSFORMER CHART A simplified selection of the proper transformer for use as a replacement in radio receivers or in the construction of audio amplifiers. It's very clean, very Apr 8, 2016 · Part Number: 1620 Output transformer, push-pull, 20W , primary 6,600 ct, 158 ma. A 6AQ5 really wants a higher B+ than a 25L6. It is made of imported Japanese Z11/0. 1V) and divide by the power (choose 1W) then you end up with about a 4900 Ohm SE primary and an 8 Ohm secondary. DYNACO A-410 Super Fidelity Output Transformer for 6V6, 6AQ5 or EL 84s, used in good condition. Jun 20, 2025 · I will shamefully confess that being cheap and wanting to get away with using a control transformer for my "Mirror Mite" power supply was a motivating factor to build an enclosed cabinet. This tech note relates to the US Federal Regulation known as 10 CFR 431 Subpart K (DOE), and the other is around the short circuit current at the terminals of the transformer second-ary. I can't find an output transformer anywhere with those specs. , secondary 4-8-16 Apr 8, 2016 · Part Number: 1609A Output transformer, push-pull, 10W , primary 10,000 ct, 100 ma. Apart from circuit changes, there is a new vibrator and speaker transformer, a 6U9, and an extra 6AQ5. I also included a schematic for a 5 tube guitar amp that uses a unique power supply that runs a 100 mA heater string on DC, makes 165 volts for the output tube screen grids, and 330 volts for everything else. I just took the parts and don't have the schematic but under what conditions would you use a 17K output transformer (with a 6AQ5)? My guess is maybe they didn't go for the max output and used a bigger transformer but biased it colder? I'm looking for a replacement audio output transformer for my Drake 2B receiver. Likewise when used to couple a higher impedance plate, the secondary will be correspondingly higher. The output transformer for my prototyping is another $1 hamfest special, 3W- 5W sized with a 7K:4 ohm impedance ratio. . So, how do we determine which of our output transformers will match that impedance range? With some simple test equipment and ohms law, we can calculate the impedance of an output transformer, but first lets look at the Apr 15, 2009 · With equivalent plate voltages and running both types of tubes at reasonable plate dissipations, the 6AQ5 should require a more negative bias voltage than the 6BQ5. 4 watts or so in tetrode. The 6AQ5 pentodes are wired in a push-pull configuration and drive the output transformer, a P-T291 standard replacement type. Oct 23, 2025 · What is Transformer Impedance? Learn the definition, calculation, testing methods, percentage impedance and fault current limitation. Proper impedance management is essential for optimal performance. Both have a 2. 6AQ5 is the audio output tube, so presumably about 5K primary Mar 11, 2010 · A single-ended 6AQ5/6005 stereo amplifier with all seven pin tubes would be kinda cool to me. The Model T car radio has already been described in detail here. Attached is one In found that was said to sound good as an example of what I am looking for, unless you think this one looks reasonable to try. The output transformer matches the high, 5000 ohm load impedance of the 6AQ5 tube to the low, 8 ohm impedance of the speaker or headphones. The amp came with big 95-1660 output transformers with a unique output configuration, two Sylvania USA 6BQ5s and a Sylvania USA 5U4GB. For the "ultimate" in Push-Pull output see our line of epoxy potted output transformers (1650 potted series). Sep 13, 2025 · 10K PP UL AUDIO OUTPUT TRANSFORMERS (pair) FOR 6V6 6AQ5 6E6 6E5 6BQ5 7189 42 43 I was using 6aq5's with a 7k impedance and the amp seemed to be a little dark. Chief amongst these is the choice of rectifier for the power supply. I think that I will be able to gather around 4 or 5 of the 6AQ5 tubes, can I arrange them by 2 or by 4 in parallel so I can get some more wattage ? Jun 19, 2013 · The power supply was just based on what was convenient (the original chassis I used had dual 5Y3s), but you could easily use a solid-state rectifier, 5U4 rectifier tube, or any of many other options- as long as you wound up with roughly the same voltages. Nov 5, 2018 · I believe running the 3. There are several factors to understand. May 31, 2012 · What will you be using for an output transformer? You really need to match the output tube and transformer with a power transformer that will provide a suitable B+. + Average Reactance in % ++Average Impedance in % (b) Standard Range in Impedances for Two-Winding Power Transformers Rated at 55C Rise (Both 25- and 60-cycle transformers. In most cases, two Stancor part numbers are indicated in order to give a Jan 1, 2020 · The power transformer is off the chassis, but I have it, and the OE Multi-cap. 000 VOICE +1 db fram -50. It affects short circuit protection, voltage regulation, and system efficiency. , secondary 4-8-16 Jul 26, 2019 · H all, I obtained some 6AV6 and 6AQ5, along with a couple of Altronics M1120 transformers: Cheap Output Transformers to use as output transformers (Somebody worked out these suit 6V6 at about 8K impedance). However, if I really wanted to build an exposed chassis I could do so using one of those Triad N-68X Isolation transformers in reverse, using the two primaries in series for the same 240V output. As I love the EL84 sound, I decided to put two of those in parallel, for a ~8-10W power rating. Hammond's 1608a-1650a series of tube output transformers are designed for push-pull tube output circuits and are ideal for triode, Ultra-Linear pentode, pentode, and tetrode connected audio output applications. Nov 3, 2020 · My question is what impedance transformers will I need? I've read that parallel tube designs like 1/2 the normal rated impedance for SE use. 000 -50,000 7-50,000 7-50,000 10-50,000 -50,000 -50,000 -50,000 2-50. May 8, 2025 · Board-type bilevel single-ended Class A output transformer primary impedance 5. A cheap build, transformer free from some renovations at work, wallwart $2 from a thrift store, power transformer under $20, 12AQ5' are cheaper than 6AQ5's. , secondary 4-8-16 Mar 11, 2010 · I've got one breadboarded using the 6N6G as output and 26s as inputs. ) will change optimum plate to plate load impedance. To use this chart, check the first column for the tube being used, then read across for the applicable operating characteristics and correct Stancor transformer. Simplify voltage drop & current computations to improve transformer performance. Apr 30, 2010 · Valve amps naturally have a high output Impedance and the output Voltage will automatically rise in an attempt to maintain constant power to the speaker. I have James universal output transformers with a 5K primary tap, and some 6005's. Apr 8, 2016 · Part Number: 1650E Output transformer, push-pull, 15W , primary 8,000 ct, 100 ma. 6k output transformers (UTC LS63, which I should have kept!). The H-20-7U is also designed to be used under three staged amplifications, such as the input, the driver, and the output stages. I've also read this tube, and it's US electrical equiv the 6AQ5, like 5K in an SE amp, so does a 2. Only a few of the most popular tubes are shown. 301 Moved Permanently nginx/1. With the Hammond you can try a few different impedance options. It would interesting to breadboard a stereo amp. The Stancor A-3894 125-watt modulation transformer was about $36 in a catalog while the A-3893 60-watt version was about $28. Jan 31, 2023 · Like the title says, I'm looking for a simple PP design for a project, idea would use 1 6SN7 and 2 output tubes per channel. Note: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. The average beam power output tube, such as the 6V6 requires a load of around 5,000 ohms, and the average speaker voice coil can vary from as low as 1 ohm to 8 ohms or more. 835 watt heater with far less emission capability, requiring a higher load impedance. 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 connected audio output applications. If it completely saturates above 20hz, having more gain margin below that point doesn't help any. In particular, if the output transformer secondary and speaker coil have an impedance greater than 4 Ω, the value of R 15 may be increased somewhat. Rated for 10W @ 20Hz-20K Apr 8, 2016 · Part Number: 1608 Output transformer, push-pull, 10W , primary 8,000 ct, 100 ma. One of the distinguishing features of a 6AQ5 tube amp is its single-ended design. 2. ucukor pnjgtbr hnil qbem nknw dwvinw ijjiittt vqw hrema omzwwb hibis nlgef tkyw gixbjy vdpwdyr