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Now that the holiday season is here I want ot start on this OTL 6336A amp project. I'd prefer to build a circlotron since it looks inherently superior to the other designs. I'll have a load of about 50 ohms so power output won't be such a problem. Are there any good established designs out there? links or schematics appreciated.
Also what is the best driver tube for 6336As assuming a B+ of around 150-180V ?John
Follow Ups:
John,I take it that your 50ohm speaker is relatively efficent? I just ask this, because due to the lower (200ohm) Rp of the 6336, you shouldn't need more than 4 power tubes to get the Zout low enough for good drive. Using additional power tubes might be a case of diminishing returns.
My suggestion is that you wire the amp such that section A of each tube forms one circlotron bank, and section B of each tube forms the other circlotron bank.In doing this, you would be able to run with odd numbers of tubes.. 1, 3, 5 etc. and see what works best.
Obviously, using the Circlotron topology is a foregone conclusion. I'm clearly biased in this regard, but in all frankness, nothing else really makes sense to me. I see no advantage in totem-pole or H-bridge outputs.
Not sure what the 'best' driver is for the 6336, but I've seen M-60 Mk.II modified to use 6336, and they retained the stock 6SN7 drivers. Paul Speltz (paulspeltz@hotmail.com) would be a good person to ask - he built a 6366 based M-60 set several years ago.
Thanks for that info- it sort of confirms what i thought. My speakers should be around 89db efficient so 25wpc will be OK.
Hopefully someone else will pickup on this thread and suggest some starting circuits....I don't see much point re-inventing the wheel for just one amp!John Corneille
Tubecad has a simple designe that looked nice. http://www.tubecad.com/
december2000/page14.html true it calls for a 6as7a and a ballenced input but it looks like a real good starting point. I wonder if anyone
ever built it and how they liked it.
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