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#1
02-10-2008, 07:30 PM
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Here is a simple schmatic and diagram that I made up for replacing the old 212-63 selenium convergence rectifiers found in pre 1968 zenith color sets. You want to use 1n4005 (nte-116) general purpose silicon diodes (1amp, 600 PIV). I have a schematic for replacing the 212-72 rectifers for zenith color sets made between 1968- about 1978. I suggest replacing this unit even if your convergence is ok. Even if they seem ok, these leak badly reverse biased at RX100 on your vom. The 212-72 is no better, if not worse than the 212-63.
After replacing this selenium, you will be rewarded with easy to adjust convergence. Heres some pics of the job I did on a '66 zenith 25MC46 last week:
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I tolerate the present by living in the past... To see drh4683's photo page, click here To see drh4683's youtube page, click here Last edited by drh4683; 03-14-2010 at 10:11 PM. 
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#2
02-11-2008, 11:56 PM
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Thank you Doug for documenting and keeping photos of your progress. The schematic and pictures will be a great help. I'll post another reply after I've changed out the selinium convergance rects. Thank you again.
Matt Davala
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