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In Reply to: RE: oscillating 6550 set amp. long posted by frankford on March 04, 2012 at 14:00:10
"When I hook up the heaters per spec, I get no sound out of the speakers. The 6550's don't heat up at all."
Are you saying if you hook up the heaters, as shown in the schematic, the heaters don't even light up?
But if you don't ground one side, leaving everything else the same, they do light up?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
yes, per schematic and pictures provided by manufacturer the 6550's will not heat up.
With the tubes out, and neither side of the filament winding grounded, measure the resistance of the filament winding to ground.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Did you try ohming out the 6550 filaments to see if they cooked?
I have no idea what number you should get, but they shouldn't be open (couldn't find the infinity key)
Kelly
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