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Old 02-26-2026, 01:22 PM
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bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,814
Work continues on the power supply chassis. The second anode and focus filter caps have been removed.


That gunk appears to be wax.


Now I can down into this area and really clean it out. Lots of residue I presume from when the original HV transformer died.


Here they are after some rust removal and cleaning. They are oiled filled and likely still good. Made from a steel box soldered closed with ceramic insulated lugs.

I'll test them and try using in my test setup before reinstalling them. If either is bad, I'll try to open up and hide new caps inside. Yes, I know they might contain PCBs.

Each contains two caps with a common lead in them. Used in a PI filter configuration with a filter choke between them.

I don't suppose anyone have a clear photo of the original labels? Mine were already gone when I got the set.


I've also been experimenting with replacing the rectifier tube sockets.


The chassis hole is a bit too small for these more modern plastic and phenolic sockets. Rather than enlarge the hole, I slightly filed down one of the sockets just enough to fit.



Unfortunately, the chassis steel is much thicker than usual so I can't use the snap ring.

I'll likely just go with something that is functional and safe for now while I search for a closer match to the original style.
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