Quote:
Originally Posted by Kevin Kuehn
How long did it usually take to act up with the cover on? Hopefully the 723's current limiting will keep things in check until you return.
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It took maybe 10-15 minutes to lock up. The symptom was/is a frozen frequency readout. When I cooled the 723, I monitored the voltage rise from around 4.6V to a bit over 5.0. Function returned but as the voltage on the test point dropped below 4.8 or so, the readout froze again. I could repeat this over and over. My plan was to freeze the 3055 and see what that did but, as stated, the 8600 never lost function last night. During lockups, I did turn the trimmer so it would maintain 5V DC. Last night with the trimmer maxed and normal function maintained, the voltage was around 5.3V. That scared me so I adjusted it to 5.003V DC. We'll see what I find in a few hours with the cover on all day. My attempts at doing a comprehensive alignment on the RCA, probably one of, if not the, most challenging early era TVs to get just right, even with an enormous amount of help and guidance from Penthode, were so compromised by faulty equipment and then issues with this piece, I had to abandon that project. I'm hoping I can get this working reliably again so I can finish the RCA.