Check Grid #1 of the Audio Output Tube. It must be negative when measured to the cathode of the tube. Often the coupling capacitor to the previous stage is leaky allowing the grid to become positive. This causes distortion and the tube draws excessive current.
If your output tube is octal, pin #5 will usually be grid #1 and pin #8 cathode. (6K6, 6F6, 6V6 50L6 25L6) If your tube is the older 6 pin, grid #1 is pin #4 and cathode pin #5. (41, 42, 43) I do not find a schematic for 800B.
Norm
: set only hummed loadly when i got it.i replaced the 20mf and 40mf filters with new 47mf caps. it plays now, has good selectivity and lots of volume. however now when the volume is turned up past about 1/4 it is really distorted. sounds like a busted speaker but it's not. i tweaked the IF xformers., didn't seem to help. i also replaced the rectifier tube.(iT was bad)also cleaned the volume control. if anyone can scan a print i would appreciate it...thanks, eddie
: set only hummed loadly when i got it.i replaced the 20mf and 40mf filters with new 47mf caps. it plays now, has good selectivity and lots of volume. however now when the volume is turned up past about 1/4 it is really distorted. sounds like a busted speaker but it's not. i tweaked the IF xformers., didn't seem to help. i also replaced the rectifier tube.(iT was bad)also cleaned the volume control. if anyone can scan a print i would appreciate it...thanks, eddie