Quote:
Originally Posted by zeno
Run for about 30 sec then unpower & feel the 2SD1555.
To hot to touch most likely bad FBT or rectifier off it.
If cool or a little warm turn up variac & see if things improve.
The amps sometimes fall as the AC volts go up.
Keep in mind the HOT can short again if not careful. My advantage
doing this was knowing what I could get away with !
73 Zeno 
LFOD ! |
The transistor was cool to the touch and raising the AC caused the amps to go up. Then the screen started pulsing and an odd smell filled my shop. Something is giving off heat somewhere on the board. A laser thermometer really would come in handy probably.
I'm going to look through some case histories and see if any sets in the book have had the same issue or something close.