50-922 restoration problems

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50-922 restoration problems

Ron Ramirez
Silent Key

Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand State, Province, Country: Indiana

01-19-2011, 04:42 PM

Terry is right. Model 50-621, a set designed for use on AC or DC lines, or batteries, has a very similar RF coil. The 50-621 schematic gives the value of the little coupling cap as 10 pF.

Pin 6 of the 7A8 is the control grid and will have AVC voltage applied to it. I would expect this voltage to be in the neighborhood of 0 to -10 VDC, depending on whether the set is tuned to a weak station, a strong station, or no station at all when you make the measurement. The AVC should be more negative on a strong station.

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Ron Ramirez
Ferdinand IN

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50-922 restoration problems - by nash - 01-15-2011, 12:30 AM

Re: 50-922 restoration problems - by 7estatdef - 01-15-2011, 09:00 PM

Re: 50-922 restoration problems - by nash - 01-18-2011, 12:52 PM

Re: 50-922 restoration problems - by nash - 01-19-2011, 01:23 PM

Re: 50-922 restoration problems - by 7estatdef - 01-19-2011, 04:16 PM

Re: 50-922 restoration problems - by Ron Ramirez - 01-19-2011, 04:42 PM

Re: 50-922 restoration problems - by 7estatdef - 01-20-2011, 07:24 PM

Re: 50-922 restoration problems - by nash - 01-21-2011, 05:19 PM

Re: 50-922 restoration problems - by nash - 01-23-2011, 12:42 AM

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