1973 Twin Reverb

I tried a lot of new stuff with this amp, things I'd always wanted to on a later Silverface Twin . . . the owner was willing and the amp had already been modified.  

In addition to the general overhaul the amp required, I dropped the B+ voltage to around 360V using a mosfet/zener regulator circuit.  This was to get a little more warmth from the circuit, and to drop the power so we could use some old 50's P12N type speakers.  I also added a little series resistance to the first two filter capacitor nodes to simulate the response of an old amp with worn-out capacitors.

I also converted the normal channel into a simplified Dumble-ish clean channel circuit and added a phase inverter "bias" control to replace the PPIMV that had already been installed.

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