Newcomb H50 Conversion

I converted this movie theater/PA amp into a guitar amp.  Dual GZ34 rectified with four cathode biased KT66s.  All octal preamps running on a DC filament supply.

Input 1 uses a 6SN7 cascode input followed by a defeat-able single knob tone control and volume with a pull-boost feature.  The following stage is a 6SF5 anode follower.  Input 2 is Marshall-y with a couple 6SL7 stages.  After the inputs are mixed, a 6SN7 dc-coupled cathode follower drives the tone stack.  The amp also has a global negative feedback loop.

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