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Normally too loud is not a problem as long as minimum pot setting is at the lower end of listenable. Is it hitting distortion?
It looks like an AA6 so no 'phunky philco phase inverter' to cause problems. If it is fragile check voltages against the print. You may want to look for other schematics for it with more voltage data. You ought to be able to check for resistors that have drifted high without desoldering or disturbing any, and if they are that brittle you may just want to replace them.
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