Nakamichi PA7II: HF noise-oscillation issue

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anatech

anatech

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Joined 2004
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Hi jvhb,
The THD in the right channel is however somewhat higher than in the left, and the distortion shape is not nearly as pretty. To match the nice low 2nd-3rd harmonics of the left channel, I have to turn the Iq way up: Around 170mV (and ditto mA) it cleans up very nicely, but that is of course much too hot for continual use.. Will perhaps try with a different "driver quad" and see if it helps.
Click to expand...
You may find that it comes down once your other outputs are back in place.

-Chris
 
jvhb

jvhb

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Joined 2013
audioberg.dk/
Case closed

Just want to confirm that the amp is indeed fixed and working well.
The original fault must have been the R160R, as described in my post #17.

The distortion residual/harmonics in the right channel never did get as nice as the left channel though. It was allright, but not as cleanly 2nd harmonic as the left. My guess is this is related to the matching of the driver transistors - or lack thereof.

Thanks again for all your help and kind comments! :cool:
 
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