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Going to the moon...

Sounds like an interesting, if somewhat impractical design. I don't keep up with the latest developments in decades old tubes, so you'll have to forgive my ignorance regarding a "Gary Pimm style" CCS and "Parafeed". How does the thing sound besides the soundstaging being very deep? What is the power output? What is the output impedance?

I'm kind of curious about the lack of degeneration. Have you measured the distortion? Have you compared the circuit with and without degeneration, both with listening tests and measurements?

Let's assume for a moment that the circuit sounds much better without the degeneration, even though the measurements are basically the same. Then you would still have the question of what is causing the sonic difference. Is it the degeneration, or the presence of the resistors?

I've heard some speaker designers swear that getting rid of resistors in the crossover networks (by carefully matching the sensitivities of the raw drivers) made huge improvements in sound quality. The obvious conclusion there is that resistors sound bad. I don't have any details on that, nor any direct experience. It's possible that they were just using bad-sounding resistors, and that good-sounding resistors wouldn't have the same problem.

Another way to do a test like this would be to take a circuit that uses degeneration and then bypass the resistors with high-quality caps. Again another variable is introduced, but at least it would allow one to look at the same problem from a different angle.

Best regards,
Charles Hansen

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