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Old 10th Jan 2020, 4:13 am   #145
Argus25
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default Re: RCA AR88D Comms Receiver.

Just maybe:

Drawing out the circuit, it relies on their being absolutely no losses in the connection between the padder capacitor's (C17) ground and the TC's ground. If there was, this loss would be effectively in series with the oscillator tank circuit. Connect a heavy conductor between the padder capacitor's ground connection and the TC's ground as an experiment. The circuit config also relies on a perfect padder that has zip ESR, if there is something wrong with the dielectric there it would also cause it, but I think you have replaced that by substitution, but of so, did it have the same earth connection ? because it could just as easily be that as the padder cap itself.

If its not that maybe something has happened to the insulators that support the stator vanes on the TC, even though the ohm meter cannot measure it.
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