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Boris, Thanks for your detailed post. As for "Adjust the trim on the tube," do you mean power up the SV-1 while disassembled, listen to it's audio, engage the amp circuit and keybed, and adjust until it sounds good! Thanks for an already good post. Thanks :) glad I could be a guinea pig on this one ...

It is certainly possible to change the tube in an SV-1. It requires disassembly of the body of the machine, though - it can't be done simply by removing the window. Korg don't see it as a user-replaceable item. A starved-plate design runs the tube quite cool, and it should last many years before it ...