Quote:
Originally Posted by Electronic M
The fold-over on the bottom is indicative of bad vertical stage caps. The horizontal frequency being so far off is a symptom of bad caps in the osc, and or osc mis adjustment.
On many RCAs there are two H hold controls. One is a pot for the user to adjust (with limited range) the other is a slug tuned coil inside the set with greater range...I'd try adjusting the osc slug (if you don't know how to ID it GET a schematic before adjusting things). Make note of exactly how far you turn it so you can put it back. watch the screen as you adjust it so you see it's effect.
|
IIRC,on that model, the user HH control is the horiz frequency coil.
The first thing, I do is replace the .01 cap, across the phasing coil, located on the horiz osc board. The small board with only one tube, 6CG7.
It's a typical RCA Syncroguide circuit. Just about any RCA schematic of the same era will work.
The vertical circuit is different, as it generally needs a complete re-cap.
Did many of both.
