Tube line stage has mono switch. When switching on mono there is an ungodly hum happening. This is only evident when listening to vinyl through phono preamp. When switched over and listening to cd the mono switch works just fine no hum. Any advice would be great.
The tube is Microphonic! Deep six the tube and call it a day. If you don't mind the lower gain with the 12at7 just use that one! BTW: My phono preamp sounds better with a 12at7 and it should use a 12ax7.
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