Quote:
Originally Posted by Electronic M
Even bottom of the barrel cheap mid-late 30's AA5s had AVC, but in the early 30's it wasn't universal yet. It was typically derived from the detector or a second diode plate in the detector tube (which was the reason why tubes like the 6AV6 and 6SQ7 had 2 extra diode plates instead of on just one).
If there is no AVC or defective AVC the volume will vary widely in step with RF carrier strength...Ever operate a working 1920's TRF circuit based receiver? TRFs almost always lack AVC and with the volume cranked to 11 they will struggle to put out enough volume to listen on a distant or low power station but blow your eardrums out on a strong local...Superhet sets can act the same without AVC.
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Let me study up on the schematic for this radio again and see if it does actually have AVC on it. If it does I would be awfully shocked that it does, and I'll have to figure out which of the 3 tubes for the tuner section is powering the AVC circuit and try subbing out tubes.
08-05-2019, 10:23 PM
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