reduce gain JCM800

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Cathode resistor and the voltage dividers after the coupling caps.

Have you tried it with a 12au7, 12ay7 or 12at7 in the V1 position? That would definitely reduce the gain.

You could mod the low channel to be like the fender bassman bright channel.
 
You have *two* inputs, a boosted very high gain one and a "normal" one ... which I would not exactly call "clean" anyway, it will distort as much as , say, a regular Plexi Marshall.

So if you want "cleaner sound while using pedals" just plug into input 2, that´s what it´s there for.

Tube rolling, pulling a cathode cap, while Technically correct, will only have a mild effect (6dB at best) , Input 1 will still have lots of gain.

Want not-so-dirty sound? (it will never be *clean*)
What about turning first volume control down 1 or 2 notches?
That´s what volume controls are for.
 
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