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Noisy Fender Supersonic

I recently purchased a Fender Supersonic head. I know valve amps are noisier than solid state but the clean channel on the amp, especially the Bassman setting has lots of background hiss. Even with no guitar plugged in and the volume completely off, there is a hiss that is very loud. The lead channel is fine and I have checked cables, different speakers, different wall socket, etc.

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