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#76
06-04-2020, 06:26 PM
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Not to threadjack, but anyone here have any ideas on what to do if the tuner's dead? My '4 is good up to the tuner now. But I can't get a darn signal from the antenna through the tuner. I *think* the issue is in the RF amp, but this thing s so stuffed with...stuff, that it's hard to nail it down. Naturally, RCA's literature isn't useful here. I tried resistance checks via Sam's, but that was inconclusive (I'll try again with someone to write the results for me.)
Any ideas? Also, what's the 'normal' agc voltage for this puppy? 
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#77
06-08-2020, 10:26 PM
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Tuner problems are mostly mechanical and straightforward. Check first the tubes are lit and the prerequisite B+ is present. No signal the AGC should be close to zero volts.
Can you inject a signal to the IF input? Do you get snow? Has anyone tampered with the adjustments? Is the local oscillator working? Post some more details as the problem should be easyy to diagnose.
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#78
06-09-2020, 10:33 AM
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My working assembled set is not on the bench presently and has stuff sitting on it blocking me from opening it for measurements.
If you haven't already done so definitely clean the contacts in the tuner.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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