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hmmm if the sams says to clip a wire across the coil as part of the setup process, then I can presume its not really a horz freq adj as implied on the schematic, That plus the fact that it suddenly stopped working points away from the coil as an issue). a stabilizer is not the same as a freq adjustment coil.
You can try it but if you dont get instant changes the don't go tweeking. I really doubt its going to fix it.
Next up, was there any thing else that may have happened before it stopped working correctly? did you try to clean anything or do ANY other work or did you just turn it on and it stopped working?
I am presuming you already tried cleaning the pins of the sockets. The most likely error would seem to be in the feed back RC network OR the pot opening up somewhere.
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