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Class D gain

When we do that, the gain must be
restored-- add another stage of amplification if you please.
The gain of a class D amp is the relationship between the triangle wave and the incoming signal, if the amp uses pulse width modulation. You can get quite a lot of gain this way. In practice, we get enough so that we can drive the module directly with our preamps (which have no worries driving low impedances, even though they are all-tube). Most preamps don't have that kind of output voltage or current, so we boost the input signal by about 6dB using a set of low noise opamps. When opamps run with a gain of only 2 (6dB) the feedback is so high that the distortion is really stupid low so they tend to be very neutral, even at 20KHz. We're using some pretty nice opamps for this service, so the class D amp will be low noise on horns.



We do not run any significant feedback in our tube amps, because you have too many problems with phase margins and insufficient gain bandwidth product to support the feedback needed. So the distortion product tends to be a simpler kind with more lower ordered harmonics and less higher ordered, much like an SET in this regard although usually a couple of orders of magnitude less.

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