Thomas Selmer-Olsen wrote
@ Rickus - the valve socket on the PT was for the EZ81 tube rectifier it used to have. But it was on the same heater circuit as the audio tubes, which can cause hum. I decided to go diode rectified instead. That weird bracket also has the voltage selector, so decided to leave it on. But I put some heat shrink on there to insulate over the weekend.
Thanks! Very interesting.