12-14-2014, 11:39 AM
Eric
There have been several threads lately addressing the similar problem.
All I can tell you:
1. Check all tubes for shorted Filament and Cathode (uually output ad Det/1st Audio)
2. Bad grounding - rivets etc
3. Shorted Gnd to chassis if separate, or shorted Filament wire to chassis.
4. Mechanical noise from the power transformer
You have to poke around.
Like, pull tubes one by one, see if it stops and with what tube. Then go from there.
There have been several threads lately addressing the similar problem.
All I can tell you:
1. Check all tubes for shorted Filament and Cathode (uually output ad Det/1st Audio)
2. Bad grounding - rivets etc
3. Shorted Gnd to chassis if separate, or shorted Filament wire to chassis.
4. Mechanical noise from the power transformer
You have to poke around.
Like, pull tubes one by one, see if it stops and with what tube. Then go from there.
