Best drive circuit for 6as7. But I wonder do they sound ...

Best drive circuit for 6as7. But I wonder do they sound best I SE or P-P? Nevermind the outputpower just the sound Quality. Continue reading This document describes the design and construction of a tube amplifier called the SRPP POWER amplifier. It uses a 6AS7 output tube in a self-rectified parallel Hi, I know, I know again the 6AS7 OTL headphone amp. McProud. Such operating An output transformerless amplifier has to be able to drive an 8 ohm loudspeaker without difficulty; to accomplish this there of course are certain design I have some 6080 valves which I would like to use in a simple-to-build yet good sounding P-P amp. Below is the full schematic of the PA section, please note that C2a and C2c do not connect to the 7500Ω resistor, they bypass the 6AS7's The 6AS7G is a double triode with special properties. Although originally intended for regulator service, the very low plate This amplifier is designed to provide the best possible electrical and sonic performance from a Svetlana 6AS7 in a basic single-ended Class A1 circuit. Has anyone built a nice 6AS7 Its best to have a regulated power supply for measuring and evaluating these circuits, I have a 0-300V 0-100mA lab power supply for just this purpose. With retirement coming up in 2 months, I’m planning my anti the measure 295v on the plates of the 6as7's and something like 110v on the cathode. Updated April 2016. This is only the left channel. That’s the problem I’m not sure which one I should use for my build. Here's my first go at a low powered SET amp. 75" PCB. Even a 6AS7 looks like a pentode when you practically short the output with eight measly ohms (or even 16). You'll need about +-125volts peak drive voltage and the latter circuit with the choke loaded driver will do that much better. Any toughts on using on the same circuit 16 (sections) of 6as7 per channel is viable? Just add more tubes and increase the current from PSU? I have seen the Lilliput amp circuit and a couple of other 6AS7 circuits and had a thought The Lilliput produces about 2. BTW, a white follower would be the best 6AS7 OTL headamp schemes - any ideas?? Page 1 of 4 [ 38 posts ] Go to page 1, 2, 3, 4 Next Page 1 of 4 [ 38 posts ] Go to page 1, 2, 3, 4 Next I have a bunch of 6AS7G I thinking of building with in the future. A two stage amplifier with a 12AX7 driver. I don't think a CCS on top of a cascode is a good idea , also for driving a cathode The 6AS7 needs a large drive voltage to give it's max. I suppose a smaller value resistor from each tube to the common large resistor would give you a way to monitor the current per Last visit was: 25 Jul 2025 1:11 pm It is currently 25 Jul 2025 1:11 pm Here you go. Care to The 6AS7 is a low-mu octal socket twin triode originally designed as a series pass regulator in high voltage DC power supplies. Generally speaking, the best sound from 6AS7/6080 can be obtained with highish Ra (like 5-6k primary), adopting high B+ voltage (some 235V thru the valve) and some 50-60mA of current. I think this circuit from another thread fulfils these OTL Amplifier Design John Broskie's Guide to Tube Circuit Analysis & Design OTL amps, 6AS7, 6C33c, December 2013. The Svetlana 6AS7 is manufactured in the Svetlana factory in Russia, and is designed to be a direct replacement for any 6AS7. Schemas are welcome. Do the 6N6P have enough voltage swing to drive the I have a large collection of these tubes, thought I'd do my own version of the circuit, it's now something I build on a select basis for Head-Fi friends, they seem to like The Lilliput wont drive the 6AS7 to full power, the preamp tube will clip first. 300-400 ohm. The driver stage is a Svetlana 6BM8 in mu-follower Hi to all, New to this forum. ) New OTL headphone project with 6SN7 and 6AS7 Hi, After two nice builds from PCB boards of Pete Millett I wanted to start a new project, this time with a PCB board by myself. I wonder if anyone could help to contribute some schematics of amps using 6AS7G as power tubes and 6BM8 or other tubes as drivers. I found Menno Van Der Yesterday, the 6AS7 SET chassis got its first coat of oil. It uses a single 6N6P connected as LTP as driver, and two 6AS7G as output tubes. For optimal output drive the pull circuit of triodes as well, the distor- ty valve for a relatively You are misreading the schematic notes. In fact, the grid bias voltage for VI is around 1 V, so I know that the 6AS7 can be very mismatched, so I was considering making the FET biasing adjustable, but would like to know the best way to do it reliably. The large drive requirement is the only downer Because V2 is a push- transformer. My project for a 6AS7 PP stereo amplifier is nearing a reality, however when considering various design options I have a On a 6AS7 I would not use a 1M grid leak resistor; change both of them to 47k. The Svetlana 6AS7A was originally A 6AS7 is a poor choice for audio (don't let that stop you). 5" x 2. A single 6AS7 SE can do stereo; it takes two 300B in SE to do stereo. I realize The circuit consists of 3 basic functional blocks: An input buffer, an active tone stack, and a gain/output stage. Checked links from Svetlana Tech Conclusions Well, all of these amps sound good, and for me at least show that the 6AS7G may be the best power tube choice in headphone amps today, due to its The 6AS7 doesn't have much voltage gain and requires a lot of drive voltage. Stereo image was poor unless you moved off-center and, for an amp that has a freq response down to near 0Hz, bass was For best drive at low frequency (where you may need it), C1 should be very low attenuation, much better than -3dB at lowest frequency. --Or so Im told, I may be wrong here though. The circuit includes a switch that will bypass the tone stack, connecting the output if the input 80W 31LQ6-based 4X150A-based (for power supply see above) 6AQ5-based 6AS7-based Futterman Style OTL (for power supply see above) Class B2 6N7 Can the Futterman style design for the 6AS7 be modified to use other tubes? if so what types? What is the plate impedance of the 6N6P? 68 ohm? Is the symbol Ri for plate impedance? I like the simplicity Who is online Users browsing this forum: RomesInMil and 2 guests The 6AS7/Russian 6C13s has rather fragile cathode-connections that serve as 'fuses' should they arc-over, which then destroys the tube when they fail. Does any member here has any schematic using 6as7 as I chose to omit a cathode bypass ca- pacitor—the gain of the drive circuit is more than sufficient to permit full drive from a standard CD line source. The driver xfmr would cost a lot plus, phase shift makes applying feedback difficult. Others might prefer An output transformerless amplifier has to be able to drive an 8 ohm loudspeaker without difficulty; to accomplish this there of course are certain design 50s RCA 6AS7 project Page 1 of 2 [ 11 posts ] Go to page 1, 2 Next Page 1 of 2 [ 11 posts ] Go to page 1, 2 Next The 6AS7 always seemed like a solution in search of a problem. This page is about OTL amps, strengths and weaknesses, and why not having an output Except that knockbill's circuit also provides bias adjustment in addition to a balance adjustment. Doesn't cost that much and you can match them yourself. Here I will publish a Headphone Amplifier with 6N1P and 6AS7 based on the optimized Morgan Jones circuit with OTL output. The lilliput amp isn't even close, unless it's driven by a very large signal that is. Cathode-Follower OTL and SIT FETs Funny, I hooked it up to my best speakers yesterday and it sounded - OK. I think it will work better in the circuit below in place of a 396A. This valve could be used in low voltage The circuit should work about as shown, but gain will be low, and you'll want gNFB on it. The AC anode resistance is very low at 280 Ohms and the mutual conductance is considerable at 7. I use low current drive in my amp and love the sound it makes. 580 - 300 ohm, I think this is the best tube cathode follower for OTL! Ri is aprox. The purple heart used for this chassis is definitely much deeper in tone than that used on the The 6DJ8 Headphone Amp. A long time ago John Hi Everyone, this is a Final wiring of a SRPP 6SL7; 6AS7 Power amplifier that needs a going over, to see if I have everything hooked up right. The driver stage is a Svetlana 6BM8 in mu-follower Because V2 is a push- transformer. I've attached a schematic of my own take on the 6AS7 pp idea. I also have designed 6AS7G SE if you need. Except that knockbill's circuit also provides bias adjustment in addition to a balance adjustment. A bit late but saw your schematic for the PP amp. I have heard that the Bottlethat offer kits sound very good specially when Aikido Push-Pull 13 August 2016 Circlotron—Once Again The Circlotron circuit remains— after almost twenty years of my covering the topology —a fountain that never runs 6AS7 OTL headamp schemes - any ideas?? Page 3 of 4 [ 38 posts ] Go to page Previous 1, 2, 3, 4 Next Page 3 of 4 [ 38 posts ] Go to page Previous 1, 2, 3, 4 Next The best is when you buy a box of 100 pieces of the cheap russian 6H13C, thats the russian equivalent of the 6080. The stereo version utilizes three dual-triodes for drivers and one 6AS7 power tube per The pre-amp circuit, except for the tube stages, is laid out on a ~6. 6AS7 or 6080 would also work, of course. I have searched for the circuit on the internet I hope I'm not opening a can of worms here Anyhow, I found an old Glass Audio design for an OTL amp, using 6AS7 tubes (Relevant section shown only) To Hi Alex A 6AS7 or 6080 pp is a superb sounding amp. looking for overall gain of 6-8 A) for the step-up Here is a first pass on your proposed PP 6AS7G Amp. (6V6 or EL84 won't give enough Vg-k for the LM317 to work. If I used Who is online Users browsing this forum: Google [Bot], krca52 and 2 guests I have seen the Lilliput amp circuit and a couple of other 6AS7 circuits and had a thought The Lilliput produces about 2. THIS is the preliminary schematic. As an audio tube, it has two features which make it excellent for speech Hi everbody, Having bought a bunch of 6AS7 and 6SN7 double triodes for pennies and gotten my hands on a pair of nice 8kohm PP OPTs, I started to look for suitable schematic. The 6AS7 is a high quali- is 3545 . Only two valves in the audio circuit and Good Sunday everyone, How possible is it to use a 6AS7 to drive a sweep tube P-P? The 6AS7 would be “driven” from a phase inverter. These Hello I have some 6as7 and 6sn7 tube not being used and would like to build my first headphone amp. The gain from the input to the 6AS7 grids is 350X. Granted it's a little harder to independently bias and balance two tubes. An output transformerless amplifier has to be The bypass capacitors are 40uF/150V. That is Vp of 185V, which is a pretty common and good operating point Lookin at áudio mirror 20w with 2 6as7 per channel. Here is that circuit Thats the problem with connected cathodes, it needs balanced sections. One 6AS7 Headphone Amplifier Hi,i just got my HD650 last week and want to build a cheap good amp to drive it nicely. The Svetlana 6AS7A was originally designed as a series I have the same OTL 6AS7 /6H13C Russian/ and Sen. . After many The Svetlana 6AS7 has an indirectly-heated unipotential cathode. TDSL is advert free and is funded by . The heater may be DC operated for the absolute best hum/noise performance. Better would be the 6336 or 6528 which were intended to supersede the 6AS7/6080 in pass-tube service. Happy New Year, one and all. G. The self-bias losses are also Is anyone familiar with the "sound" of a 6GK5? It certainly has the specs to drive a 6AS7. Was a bit curious about the SE schematic. 5W as shown in the circuit, using one half of the dual triode per Who is online Users browsing this forum: Google [Bot], krca52 and 2 guests Likely tube choices would be EL86, 6P3S (the cheaper version), or 6AV5GT. +-100V is about right. There is 200V p-p of signal to drive each 6AS7 grid, When boot strapping is added in that will I have some space left on the PCB i designed and was wondering if there is anything i can add to the attached schematic that would improve the performance? A simple resistor was deliberately chosen 6080 comparisons 6AS7 comparisons Output Impedance (nominal approximation): Output impedance is the first traditional measurement demonstrating differences 6AS7 Substitutes 6AS7 Ratings 6AS7 Application Data 6AS7 Data sheet links All content on this page is copyright 1997-2026 Duncan Amplification Limited. He really likes 6AS7's, but usually with transformer-coupled drivers. I advise You this link! It's the 6AS7-G, a high-power twin-triode that was designed for use in regu-lated power supplies and television receivers. The datasheet mentions television use but did it ever show up in any tv? Pretty sure there were Hi All, I am trying to get some info for a friend, on how to wire a Twin Triode in a SE 6AS7G Tube Power amplifier. Will it work? Why do I want to do This Class A tube headphone amp project, which the author created for Vintage Audio, includes a 6SL7GT for the input stage and a 6AS7G for Who is online Users browsing this forum: No registered users and 2 guests The Svetlana 6AS7 has an indirectly-heated unipotential cathode. I have few questions for you: 1. General Characteristics 6AS7 Output Transformer Less (OTL) Tube Amp ideas? Page 1 of 1 [ 6 posts ] Page 1 of 1 [ 6 posts ] hey folks, got some questions for ya: going to try a 6as7 loaded with a step-up transformer for voltage gain connected to a 6as7 cathode follower. Need some suggestions for a 6AS7/6080 SE amp Page 1 of 2 [ 11 posts ] Go to page 1, 2 Next Page 1 of 2 [ 11 posts ] Go to page 1, 2 Next However, amending this circuit with simple class a/b output stage cathode bias would, if the preceding stages can drive it, seem like an easy 'beginners'-circuit. This will improve the stability of the tube operating point, improving resolution. For optimal output drive the pull circuit of triodes as well, the distor- ty valve for a relatively I just bought a matched 6as7 pair and i was thinking about building a 6as7 otl amp but with 2 6as7's in PSE (similar to woo audio 2) It needs more power to drive than a single 6as7 triode so i think that 1/2 Who is online Users browsing this forum: No registered users and 0 guests This very special, one of a kind, SET is based on the 6AS7 twin power triode. We want to try and wire the tube as Push Pull in which the two Plates inside will push pull Has this circuit been built ? It looks like the cathode bias network on each cathode of the 6AS7 is redundant . Hi all, Walking along the lines of a 6AS7 headphone buffer, I butchered the input section of a 6922 and left the 6AS7 alone and ended up with the circuit below. 7K) output Description of the audio circuit Figure 1 shows the circuit diagram of the amplifier. The grid drive is enormous, requiring heroic drivers. 5 mA/V. Running a pair of 6DQ6 Beam Power tubes in triode mode and push pull is a completely different thing than a pair of 300B triodes in with C. 6AS7 power stage, 12AX7 driver stage, 5V4G rectifier, 15W Edcor GXSE (1. Other This amplifier is designed to provide the best possible electrical and sonic performance from a Svetlana 6AS7 in a basic single-ended Class A1 circuit. The driver operating point is inconsistent with the specifications of the 6sl7, We use the 6AS7G power triode for a number of reasons particular to the type of amplifiers that we make: OTLs. The tube will dissipate 6 watts as heat; the power output will be much less. 5W as shown in the circuit, using one half of the dual triode per channel. Connections for the tone control pots are provided by pin headers in the middle of the board.


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