[cathoderay57]

Hi Paul. The Trader Sheet #1221 is in a more standard layout than the Cossor one and is easier (at least for me) to understand so I'll refer to component numbers in the Trader. The volume control is the AGC load resistor R26 although exactly why advancing it to max removes the rustling I don't know. maybe worth checking the resistance of the volume control pot and whether there is any leakage path between the track and case, with its cables disconnected. I would still try disconnecting one end of R21 the AGC feed resistor. You said that you cleaned all the switches so presumably that included the radio/gram switch? Jerry