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#1
03-18-2021, 04:05 PM
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Rca b&w ac192w
I dug this out of a corner today. A Kutztown find a while back. Like new and powered right up and a strong CRT. All SS I think. Problem is distorted audio. Like it is miss tuned upstream somewhere. Fine tuning keeps the distortion across the range. Have not opened it yet nor a Sams to look at. Will open to see how it is built. 9/1978 date code. Any ideas?
__________________
“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes. 
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#2
03-18-2021, 04:31 PM
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I remember these sets, I think a slight tweak of the sound
discriminator coil is what it needs to bring the sound back in.
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#3
03-18-2021, 04:45 PM
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Quote:
John EDIT: Never mind, KCS202J (strangely, RCA included it in the PartsFinder program from the mid 90s. I'll check my notes tomorrow at work.
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#5
03-19-2021, 04:05 PM
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Those were a solid set.
As a general rule audio can be broken down to stage easily. 1) hissing but has audio. Look at sound IF 2) buzzing or ticking. Go to sound detector ( quad, disc.). 3) 60 cycle hum. Output or power supply. Detector is most common. Flag an alignment tool & rock the detector coil slug back & forth one turn. ( this may use a square slug. If it clears note how far you turned it took CW or CCW. That way you can go back if you have to. Save that note inside the set. If it drifts off again something has failed. 73 Zeno  LFOD !
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#6
03-19-2021, 04:10 PM
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I found no notes on that chassis series, but Zeno's answer is the best bet. The RCA color TVs of that same era often needed to have the sound disc tweaked with the square alignment tool. We did change a few of those coils though. Some would just need to be rocked and others drifted so far we change the coil (there might be an internal capacitor in them).
John
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Linear Mode
