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What makes a guitar amp good for bass?

The output transformer is a lot lighter than the power transformer, so an OT for guitar vs one for bass won't make much difference- maybe a couple of pounds.

Maybe in your amp. Sunn amps have enormous OTs, I have an amp specced to be flat to 20hz at 100w and the output transformer is about the size of a current SVT one, for a 100w amp.