On Mon, Mar 21, 2022 at 06:02 PM, Albert Otten wrote:
Stephen, some time ago there was a problem with S242B. The switch seemed to be
closed all the time. I assume your reading now is still in High Ampl mode.
Then it looks like the opposite failure of S242B: open all the time. That
results in pin 3 sitting at the most extreme negative voltage. The wiper of
R246 is disconnected and Amplitude has no effect at all. Perhaps you can check
the behavior of the switch with a resistance meter.
Albert
Hi Albert,
I removed the switch, tested it, cleaned it, but it¡¯s actually fine. Put it back, but nothing has changed.
I do have a perfect square wave on the High Amplitude position, it¡¯s just not more than 140mV into 50R.
This have me wonder¡. Could this be related to the bias circuit¡? Like in a tube amp?
