Hi Don
First of all, thanks for your answer.
Well, I have checked it also with a signal generator: the output signal at
R3 (AF Gain) & R5 junction is always a clean 2,2 Vpp 600 Hz tone, with RF
levels of 10 uV till 500 uV, except at close or maximum volumen. I this
case, even with a 10 uV RF level, the strange oscillation is present, just
on the negative peaks, as I told on my first post.
At RF levels above 500 uV the signal is clearly distorted (almost square,
even at minimum volume) due to overload, I think this is normal. At levels
below 10 uV, the audio level is lower also, so no problem with this
artifact.
It is quite strange cause it works fine with a resisitive load of 8 Ohm, but
not with a 8 Ohm speaker. ??
Again, many thanks.
73,
Paco
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