Re: Bush DAC 90A Conversion
If I understand the previous posts, you have disconnected the 'top' of the volume control from IFT2.
However IF voltages are still present at both diodes in V3.
A small signal may be capacitively coupled from these diode anodes to the cathode of V3.
V3 may be operating in grounded grid mode and passing a small fixed volume signal to the audio output stage.
If you temporarily connect a 0.1uF capacitor from chassis to each diode anode (pin 5 and 6) it may reduce the volume and confirm the source of the signal.
|