06-23-2014, 02:33 PM
Murf
One more time:
Does the crackling start IMMEDIATELY upon insertion of the 80 (or if it is in cold, IMMEDIATELY upon turning power on) or a second or two later?
Meantime, start checking:
1. Output transformer - input winding to output winding (or to GND). Making sure there is no electrical breakdown.
2. Field coil to GND. Or to the metal part of the speaker if it is grounded.
3. Turn out the lights and in full darkness turn on the power. See if while hearing crackling you see arcing anywhere.
One more time:
Does the crackling start IMMEDIATELY upon insertion of the 80 (or if it is in cold, IMMEDIATELY upon turning power on) or a second or two later?
Meantime, start checking:
1. Output transformer - input winding to output winding (or to GND). Making sure there is no electrical breakdown.
2. Field coil to GND. Or to the metal part of the speaker if it is grounded.
3. Turn out the lights and in full darkness turn on the power. See if while hearing crackling you see arcing anywhere.
