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Old 7th September 2009, 05:06 AM   #1
dsndblm is offline dsndblm  United States
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Default Simple 6V6 Push Pull Schematic

Hi

Can anyone recommend a simple, proven schematic for a 6V6 amp? I'd like to use 12AT7 or 12AX7's as drivers.

Thanks in advance
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Old 7th September 2009, 03:06 PM   #2
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I don't know if this qualifies as "simple", and the input tube is different, but I'd take a good look at "The Musical Machine".

http://www.audiotropic.net/Projects/machine1.html

Bill
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Old 7th September 2009, 03:19 PM   #3
Klimon is offline Klimon  Belgium
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Bear in mind that in the musical machine the 6v6's are triode-strapped, considerably reducing power (~3-4W versus ~10W in pentode). Obvious question: what speaker efficiency/room size/volume levels?

I could recommend you a simple design using input phase splitter, 6c45 drivers, mosfets and partial feedback (adaptation of a revintage SE circuit), but if you want to stick with at/ax7, it won't comply.

Simon
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Old 7th September 2009, 05:35 PM   #4
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Quote:
Originally Posted by dsndblm View Post
Hi

Can anyone recommend a simple, proven schematic for a 6V6 amp? I'd like to use 12AT7 or 12AX7's as drivers.

Thanks in advance

Boy, is this easy. Toot, toot!

Wade thru the voluminous "El Cheapo" thread. Any 6V6 family type works in the O/P positions. A 12AT7 is used as the splitter/driver. If you buy good O/P "iron", like the Z565 Dynaclone, approx. 12 UL mode WPC are available. Triode mode yields approx. 6 WPC.
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Old 7th September 2009, 06:33 PM   #5
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One of my favorites is this Grommes Little Jewel amplifier. If you don't need the phone stage, just leave it off. The output trans. primary should be 8 to 10K ohms.
http://www.grommesprecision.com/grom...ewelreview.PDF
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Old 7th September 2009, 08:47 PM   #6
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Here's another possible option:
6V6PP amp
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Old 9th September 2009, 02:30 PM   #7
Cassiel is offline Cassiel  Libya
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Hollow State, i can't find the cathode resistor of the second triode of the splitter.??? I also like self balancing paraphase splitters, here's mine:
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File Type: jpg splitter.jpg (19.7 KB, 1276 views)
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Old 9th September 2009, 04:02 PM   #8
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I built this sounds nice.

You can play around with the power supply, it is very low on filtering. I built this just to use a specific set of military surplus parts for a specific "look".
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File Type: jpg 6V6GTY PP.jpg (114.4 KB, 1306 views)
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Old 9th September 2009, 05:47 PM   #9
ChrisA is offline ChrisA  United States
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I'm looking too. Here is random rambling about what I've found.......

I'm looking for a simple 6L6 based amp. I've not yet decided exactly what I want to build yet. But the outline is like what you want: 6L6 PP power section switchable between a couple modes, ultra linear and triode. It will have a "long tailed" phase splitter made with a 12AU6 (like the paraphase in the post above) some adjustable NFB and likely a gain stage ahead of that of that with 1/2 of an 12a?7. I prefer to build on a "turret board" (see here for an example: http://www.turretboards.com/images/P...ing_loaded.jpg) and here for more info: http://en.wikipedia.org/wiki/Turret_board. I think this style of construction allows for the best reliability, serviceability and allows for future "tweeks". PCBs are very hard to service or repair and point to point amps are hard to figure out as they tend to look a bit like a rats nest of parts.

I figure there must be some classic designs that "everyone" knows about. No I'm not trying to hijack the thread, 6V6 and 6L6 are so close. In fact if you think you want an 6V6 amp, find a 6L6 amp and build that but set the bias down for the lower powered 6v6 tubes, then you have to option at a later date to re-tube the amp for more power (assumming the transformers are sized for the task.)

If you want an easy to build modern design look at Tubelab. Find the thread on this site for the "simple PP" (simple push-pull) that will be available "real soon". Or you can build is "Simple Single Ended" design that is currently available and well tested. These amps use printed circuit boards so they should go together quickly. The simple PP and SE are flexible enough to use any of several difference power tubes from "big" down to 6v6. The site is here
http://www.tubelab.com/ But it is not yet updated for the Simple PP

I'd prefer not to build on a PCB. and I'm still looking for "clasic" 6L6 designs that I can study. I'm familiar with several 6L6 based guitar amps. So far I'm not seeing a lot of difference between 1950's guitar and 50's hifi designs except that the guitar amps will have a high gain preamp section. I'm looking for hifi designs from the same era.
A good place to find guitar amp schematics, many of which use 6l6 or 6v6 is here:
http://www.schematicheaven.com/index_HTML.htm
(hint, start with the Fender "bassman" if you want PP or a "champ" for SE. Both are very simple, to simple really for hifi. but educational.)

Look at Peter Millet's site. He has many scans of 50 year old books, several of them aimed at 1950's DIY HiFiers More than a few "how to build a xxx" books and articles there, all published 50+ years ago (so that the copyrights have expired)
http://www.pmillett.com/technical_books_online.htm
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Old 9th September 2009, 09:32 PM   #10
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" i can't find the cathode resistor of the second triode of the splitter."

100 ohm resistor plus feedback resistor plus the secondary of the OP tranny to ground.

With the 6V6 you could also look for schematics designed for the EL48. With all due respect it doesn't make any sense to use a high mu tube like the 12AT7 or 12AX7 when you only need a voltage gain of about 25. There are many better sounding tubes to use.

If you insist on the 12AT7 try a LTP with a CCS as the "tail" RC coupled to the 6V6s. You will have too much gain, but you can rewire the socket for a ECC99 and be happy.

If you really want transparency and dynamics use the MagneQuest EXO-173 PPS to split the phase and drive the OP tubes. Use a single ECC99 for both channels and 4 op tubes gives you a 5 tube stereo amp. RC couple the ECC99 to the EXO-173 PPS so there is only one cap in the signal path.
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