Quote:
Originally Posted by vortalexfan
Well I figured out what my problem was, my one replacement filter cap that I installed to replace one of the old can caps on top of the chassis didn't have a good solid ground connection to the chassis, so I unsoldered the negative lead from where I had soldered it to the chassis, roughed up the metal chassis in the area where the negative capacitor lead was to go and then resoldered the negative lead to the chassis (that solved the incessant humming noise issue)
and the issue with the extremely distorted audio when being fed a signal from the RF Signal Generator, was because the grid cap for the 6J7 was grounding itself out (the grid cap wire lead had apparently lost enough of its rubber insulation inside the shielding sleeve that the shielding sleeve was causing the grid cap wire to ground out against the shielding sleeve, so I took and replaced the grid cap wire lead and BAM! the radio started working properly!
The only problem I have now is that the volume control seems to have some "dead spots" in it because it will go from completely silent to blow your ears out in a quarter turn and then I think the speaker might have some issues because the audio comes out completely distorted and barely audible at about quarter volume or a little less, and when you turn it up to about half way the sound is so distorted that you can barely hear what is being said on the radio.
Just thought I would give a little update on this radio.
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You probably have to remove the volume control and have a look inside!
IDK if the volume control is a log or a linear taper. Also, the schematic shows a 250ohm resistor in series, but the parts list shows that the resistor is part of the control. Some experimenting is needed!
Re: the next entry problem with the hum, maybe the 6J7 or the 6F6 has an H-K short.
Sure is one for the books.