Help! Oscillation sound through speakers.

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So I turned on my system yesterday and after warming up for a couple/few minutes, I heard an oscillating sound through both speakers. I immediately turned off the amp and checked the seating of all of the tubes (the power tubes are a new set installed last week) and all of the connections in the system. Found no issues and no smell of smoke.

I then turned the volume all the way down (it had been at 9 o'clock) and turned the system back on. I heard nothing but the usual noise with my ear to the drivers and, as usual, nothing two feet away. I then turned up the volume knob and the oscillating sound appeared and increased as the gain was increased. I then immediately shut of the amp and system again.

Just this morning I took off the cover. Nothing burnt or obviously wrong, except for a fuse (B+ rail?) not fully seated. It was making contact at both ends however. Could this be the problem?

Could it be something else?

TIA

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Parts Connexion

Topic - Help! Oscillation sound through speakers. - classfolkphile 06:45:58 11/09/14 (3)

Found the problem... - classfolkphile 07:21:15 11/09/14 (2)

RE: Found the problem... - Brian Levy 06:10:31 11/13/14 (1)

RE: Found the problem... - classfolkphile 10:50:14 11/13/14 (0)

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