Heater Bridge
The SLO uses AC voltage at 3.15VAC per wire for a total of 6.3VAC. This bridge crosses the voltage to the PreAmp Sockets.
Solder the twisted pair to the lower hole in the power sockets but not to the PreAmp pins just yet. Hold it in position with masking
tape until you have run your PreAmp bus wire. After the Bus Wire is installed, solder everything at one time.
