Quote:
Originally Posted by radiotvnut
I think there was a CTC101 that appeared around '80. I believe this chassis, along with the lower end CTC107,108,110 experienced early flyback failures due to a defect in the original flyback design. They were decent once the improved flyback was installed.
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I had a CTC101 (with a replaced flyback) I bought in 1982.
I used to work at the RCA Smirnoff Labs in princeton NJ back then, and the CTC101 flyback problem was due to them trying to skimp on the number of HV diodes in the flyback. The very high voltage secondary was split into 6 segments and diodes were to be placed between sections, and a final diode that would feed the fat red wire to the CRT. Ground-w1-d1-w2-d2...d5-w6-d6-fat red wire. But they tried to cost reduce this scheme, by skipping some of the diodes. Which made for twice the AC voltage per diode, and twice the AC voltage on some of the terminals inside the big epoxy lump on the side of the transformer. This became a warrenty nightmare for RCA... All the new replacements had 6 diodes. Which helped a lot, though I had a CTC101 and the replaced flyback did die around 1990.
It was a great set before that happened. Had the comb filter for better chroma luma separation.
It had a partially hot chassis, the horizontal part of the yoke was "hot", but the vertical part was "cold", along with the tuner, IF strip, audio output and CRT video amp driver circuits. The "cold" supply was derrived from separate secondaries on the flyback.
05-12-2008, 12:49 AM
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