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The diodes are on 6L6 V8 & V9, 2 of 4 tubes NOT disabled by the 60/100w switch that abruptly disconnects the cathode from ground on V6 & V7. The transformer will de-stabilize with the abrupt change in current when switching and may induce a voltage. The diode lets it bleed back to B+ at the...

I have an SOB HOB 29 head with a charred socket pin-8 on a 6L6. There is a diode across plate pin3 to ground via pin8 on 2 of 4 6L6's, but its not shown on any schematics. One was determined to be open with pin8 badly charred. What is the purpose of this and is it necessary? What is a safe...