Custom "Variac" Preamp Build

Fun project - tube preamp in an old variac enclosure.  I used a 6C8G dual triode (my favorite), set up almost like an EP2 preamp.  The top knob is gain.  I used a micro-controller based relay switching circuit so it can be bypassed with the soft LED switch (blue) on the unit or with an external footswitch.  Tight fit!

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