[R-390] Scratchy Static

[Steve Hobensack]

After my 63 Imperial warms up, there is a low level scratching in the speaker. It is there when the local gain and rf gain control is all the way down. I have isolated the problem to the audio deck, specifically the 5814 audio driver tube to the 6ak6 local gain audio output. It is not present on the line gain side of the circuitry. Before I begin clipping and testing, is there a troublesome component that others have found? The problem is still there after tube substitution.
Steve N8YE