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When I got my 6505+ years back it had a bit of that high end fizz you speak of. Its likely the amp itself but you can dial it in to get the tone you like pretty easily and knock out the fizz. Also retubing mine with JJs tamed much of the fizz and smoothed out the mids alot. Rubys arent terrible tubes being stock but I would try some JJ 6L6s in that beast.
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