Quote:
Originally Posted by old_coot88
I never seen a radio of that vintage that didn't have some degree of hum, particularly ones using direct-filament tubes (e.g., 26, 71A etc) with the filaments run on AC. Some had a 'hum balance' control but the hum was always there anyway.
|
The winding just above the rectifier filament winding has a hum filter - the center tapped 15-ohm resistor. Check it as well - bad, and it could introduce more hum.
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
|