Complementary Zen 5 Questions
I'm considering building a Zen Variations - Part 5 The Complementary Zen as a first attempt to build an amplifier.
This amp has feedback though a 4.75k resister and I am wondering about how many dBs of feedback the amp has? I would guess in the 10-20dB range since that seems to be about the amount of feedback that Mr. Pass uses AFAIK
. I am considered using a 2k resistor with a 10k pot to control the amount of feedback. I would like to have the feedback knob calibrated for the amount of feedback used but don't know how to calculate/estimate this.
An interesting thing about the circuit is that the volt divider bias for the MOSFETs are to the output rather than ground. I suspect this would give a more "dynamic" sound. I may try both and experiment
In the article it says a class A PP amp can deliver twice the current of the idle current before leaving class A: I plan to idle at 2.5A with 20V rails so does this means that the amp dissipates 100W/channel before leaving class A? From the article the amplifier seem to output about 10W/channel (.5%THD) in class A and up to about 30W/channel in class AB mode but with high distortion (10%THD).