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RE: Futterman versus whatever
Posted by Tre' on December 19, 2010 at 08:59:14:
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.