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#2
05-20-2011, 09:26 PM
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Got the horz AFC diodes in, I think I will spend some time tomorrow cleaning the crud off the PCB's really dirty. Gives me something to do while waiting for the caps. I seem to get a lot of sets with defective horz AFC diodes, whats the deal there? most of the other diodes always seem fine.
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#3
05-20-2011, 09:36 PM
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The early dual AFC diodes were selenium, but we always replaced them with 1N914's or 1N4148's from Radio Shack - they used to have them 50 to a pack for 1.99. Just use two diodes in whatever combination you are replacing, common cathode, common anode, or series. NTE177 is the analog to the 1N914's AND 1N4148's if you choose to go that route.
ECG113's ECg114's and ECG115's were the replacements back in the day. ECG updated the ECG113 to the ECG113A, a silicon replacement , when GE and International Rectifier no longer supplied the selenium ones. I guess the epoxy packages weren't moisture-proof, or the selenium degraded somehow over time. Either way, an unstable Horizontal Hold would merit replacement if the old black epoxy package was in the set. Admiral and Sylvania Color sets always seemed to have weak hold, even with new diodes... Cheers,
__________________
Brian USN RET 22YRS (Avionics/Cal) CET-Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#4
05-20-2011, 09:43 PM
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hmm I used some 1n4004's I had handy, I thought I had used those before, CTC17 and I were discussing this off line the other day, he had some concerns about the switching speed, but I though I had used them in the past.
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