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Jason: If you could somehow get a fixed/cathode switchable bias scheme in that Super, you'd have the best of both worlds. The 5F4 is fixed, yes? don't know if it's possible with that, but I did do that with a tweed pro type amp, the Sewell Wampus Cat. The WC in stock form is cathode bias ... it's sort of of a blend of the earlier, 5C5/5D5 pro with the later narrow panel circuit. Anyway, that switch is the best. Cathode is for the older tweed sound, a dense, juicy kind of saturation as you turn up. Fixed makes it louder, tighter, more definition, especially in the bass. Both modes sound so fine ... made an already great amp even more versatile.
You may also be able to swap out rectifier tubes. don't know what is possible or recommended with that amp, but rectifier tube choice can pretty noticeably change sound in other amps. Might be worth a try. If that super is fixed you'd no doubt have to rebias after a rect tube change.
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