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In Reply to: RE: Futterman versus whatever posted by decca4 on December 17, 2010 at 16:39:57
The big difference between the Futterman and the Atma-Sphere is not the parts used but the circuit.
In the Futterman one bank of tubes are cathode followers and the other is not. So there has to be compensation for this in the driver stage.
In the Atma-Sphere (Circlotron) both banks are the same with no need to compensate.
So the Circlotron is inherently a better circuit than the Futterman.
Now what that means in terms of sound and how the two compare to your ears is entirely up to you. But technically speaking, the Atma-Sphere should sound better.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
Tre
I think that how the respective amplifiers sound should be the criteria by which you judge rather than what one thinks about a particular circuitry. My point was that if you want to make a comparison between the Futterman and other OTL amps you should at least restore the Futterman and not evaluate it based on long since worn out electrolytics and other capacitors (polyester) that are not used in any design today. Have you or anyone else done that?
I have nothing whatsoever against the Ciclotron by the way, just looking for a fair test.
see above, please
There have been plenty of Futterman-style OTLs in the last 30 years. One of the best was the Prodigy, made in Texas. They went under in the early 1990s. We did get to compare the amplifiers at that time, and also last year when one came through the shop to be refurbished.
We've also done comparisons with the Sans Pariel and Triumphe (Fourier Components), the latter being a 6AS7-based version of the Futterman circuit. These comparisons were done in the late 1990s when the company was still around or just barely had gone out of business.
So the issue of newer parts, while important, may well be moot, if any of these amplifiers are considered valid Futterman candidates.
I'm of the opinion that a SEPP stage sounds better than a cathode-follower stage.
Interesting.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
NT
Sure I'm different, I use tubes!
how do the output impedances of these amplifiers compare? I suppose it depends on the tubes used. The 6LF6's, which are very hard to find now, might be one advantage for the Futerrman design.
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