Twin Reverb

A post-phase inverter master volume had already been installed in this amp, and it had ben modified slightly in other ways as well.  I put it mostly back to stock, and converted the master volume to a phase inverter bias adjustment control.  It doesn't bring the volume all the way to zero, but it sounds better than any other PPIMV I've tried in a Twin so far.

I also replaced some worn out components and all the electrolytic capacitors.

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