The noise stops when the line/tape button is pressed in (that button changes the EQ application from the line stage, to applying it to the tape buffer circuit). The EQ circuit is entirely passive, with a few polystyrene caps, a few (recently replaced) electrolytics and a few film caps. Also, the 960hz slider does not boost in the same channel that has the noise, but it does cut. Any ideas? It must be a passive component that is introducing the noise, I assumed it was broken graphite in the 960hz slider acting as an antenna.
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