Quote:
Originally Posted by miniman82
Quite the opposite. Both the 4 and 5 (special chassis) were a once only sort of thing, concerning the circuits. All sets after used the X/Z demod scheme with a trio of drivers one for each color.
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This is correct. The CTC-5 Super chassis had a lot of experiments in cost reduction that were rejected later because they just didn't work that well. High voltage too low, poor luma bandwidth/detail, poor color oscillator/hue stability, no impulse noise immunity; even the sound IF circuit was cost reduced by removing a stage, which made the FM limiting iffy at best. Reading the audio alignment procedure tells the story - first put the audio trap where it should be (but the sound is then too weak), then tune the trap off slightly to bring up the audio to an acceptable level. The later chassis with X/Z demods hit the sweet spot for cost vs. performance and was used with only minor modification for many following chassis.