Back in the 80's i used a Boss OD1 through a non master volume JMP Super Bass 100w head when playing guitar and that was the best overdive i have ever used. Very simple with just level and overdrive knobs.
These days i am using a Xvive golden brownie that can produce those JCM800 tones through my Vox VT40 and is much better than any of the inbuilt amp options.

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