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RE: If he had the class d design skills of Bruno Putseys, he might be offering one...

I don't know about that one Kirby, Putzeys hasn't done anything besides switching amps since he got out of school.

Pass on the other hand has a much more diverse and successful background. He is a cult legend for a reason.

Class D isn't black magic, heck, even I could cobble one together, as mentioned before it is nothing new or exotic.
It is challenging, in the sense that it sucks for audio.

Back on topic, which believe it or not is not Kirby's class D amp...
Here are some interesting quotes from Pass's wikpedia page:

"The SIT chip combines a square-law input character with a low impedance output to form the only solid-state gain device, which Pass claims, "behaves like a triode tube.""

"The point of the SIT is that it behaves like a triode but at lower voltages and higher currents, so it doesn't need a matching transformer to deliver power to 8 Ohms. "

"SITs have a curve which looks a lot like a triode vacuum tube; low at first and climbs steadily. The distortion curve is similar, a steady rise instead of a valley with high distortion at both ends." (Which is what Morricab stated when he said SS made more distortion at low volumes.)

So, I would consider Pass's SIT amps as "SOTA", not to be confused however with the "pinnacle" which was developed by De Forest over 100 years ago.
Everything since then, has been a compromise in one way or another.



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