S
Steve
I'm having issues setting the bias voltage for the right channel. The
service manual says to set it to 2.5mVDC. I can set the left channel
with no problem, but the right channel drifts badly with warming
up/cooling down etc. The left channel drifts around 2.1-2.8mV whether
it is just warmed up from cold or just cooled down from hot.
If I warm up the amp completely, set the right channel to 2.5, turn it
of and let it get cold, turn it back on & let it warm up, it will be
1.1mV. If I then set it to 2.5, let it sit, it will be up around 9mV.
These aren't exact figures, it drifts pretty widely. It isn't a dirty
pot, the readings aren't jittery or erratic, they just drift with
temperature variations.
I'm not sure what class this amp is, it's definantely not D, it looks
like a standard analog transistor audio amp. What would a normal
cause be for this kind of drift?
Thanks for any help, I'll gladly get more specific definite readings
if they will help.
Thanks,
Steve
service manual says to set it to 2.5mVDC. I can set the left channel
with no problem, but the right channel drifts badly with warming
up/cooling down etc. The left channel drifts around 2.1-2.8mV whether
it is just warmed up from cold or just cooled down from hot.
If I warm up the amp completely, set the right channel to 2.5, turn it
of and let it get cold, turn it back on & let it warm up, it will be
1.1mV. If I then set it to 2.5, let it sit, it will be up around 9mV.
These aren't exact figures, it drifts pretty widely. It isn't a dirty
pot, the readings aren't jittery or erratic, they just drift with
temperature variations.
I'm not sure what class this amp is, it's definantely not D, it looks
like a standard analog transistor audio amp. What would a normal
cause be for this kind of drift?
Thanks for any help, I'll gladly get more specific definite readings
if they will help.
Thanks,
Steve