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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 (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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