Harman Kardon Citation 17 Pre-Amp One Channel Intermittent
It is the relay. Tap-on/tap-off.
And, it so turns out that the previous owner had replaced the relay by kluge wiring it on the bottom of the board, holding it down with elephant-snot glue. Which, in turn, was eating the wiring.
In any case, I will order the relay tomorrow and correct the "modifications" made to the board.
Peter Wieck
Melrose Park, PA
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