orange OR15

[Valvehead]

Weird issue... The amp is working after re-tensioning the PI socket. It would cut out moving the PI tube . But strangely , the Treble pot is now acting as a " master volume " control and the mid and bass pots have zero effect on the signal. The MV and Gain pots work normal . treble on 0 and the amp has no signal. Anyone seen this issue ?? The amp has never been apart. Possibly a bad Treble pot? I can loosen the nut and move it and signal doesnt cut out so I think the solder joints are ok at the pot. I tried clean/ lube on the treble pot .

Orange OR15 SCH 115V-230V.pdf Orange OR15 SCH 115V-230V.pdf

[Jon Snell]

Bad connection or pin 1 connected to ground with a splash of solder .... who knows.
Socket issues are normally caused by incorrectly inserted valves. Check the receptacles are still receiving the pins in the centre, not down the side.
Treble issue ...
Not a lot to check here. R17 O/C?