Thanks, Guys.
Based on your responses and those on AA, I have a coincidence on my hands. Hard to believe, but there it is.
02-09-15: Garibaldi
Garibaldi,
Not necessarily a coincidence.
I suggest you reread my posted message to Atmasphere. It is possible if you powered up the amp with a 5755 tube accidently plugged in the tube socket for a 5751 there is a chance you could have damaged something in the power supply. Of course that is if the designer of the amp bonded, connected, one lead of the tube filament secondary winding of the power transformer to the chassis where also the B- of the power supply is connected. Without a wiring diagram of the amp it is purely speculation on my part.
At any rate if the above scenario is the case I can see a circuit provided if the 5755 tube was plugged in the tube socket wired for the 5751. Section #2 of the 5751 triode tube pin #6 terminal will have B+ voltage present for the plate of section #2 of the 5751 tube. Note pin #6 of 5755 is one side of the heater filament. If a completed circuit is provided through the heater out pin 4, of the 5755 tube to B- chassis then DC current will flow through the heater filament of the tube to the B- chassis. Would it be enough current to damage something in the power supply of the amp? I don't know....
Maybe if Atmasphere is still following the thread he may chime in. LOL, he could also tell me I am all wet.
I guess you will find out for sure when you get it repaired. Post back and lets us know the results afterwards.
Jim
