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#1
05-01-2025, 11:17 AM
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Another RCA service bulletin on the CTC 5
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#2
05-01-2025, 11:21 AM
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The importance of factory service bulletins
During my many years of owning a large factory service center, no tool was quite as helpful as factory service bulletins. I submitted a couple, but having them saved time and a lot of headaches.
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#3
05-01-2025, 10:12 PM
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Hmm, that post on ARF is from 2011. I think I probably read it then; I know a contrast/brightness modification for the CTC-5 was a well-known improvement "back in the early days". That must be the one. Thank you for posting it here.
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Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#4
05-02-2025, 10:50 AM
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In a similar way starting with CTC12 chassis, RCA tied the CRT cathode bias to the shunt regulator grid.
This allowed shunt regulator to be cut-off during extremely bright scenes, regulate only during darker material to maintain load on HV supply. It seemed to reduce a "blooming" issue with a CTC11, was tough to mitigate with just HV, brightness/contrast controls.
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"When resistors increase in value, they're worthless" -Dave G
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