- September 15, 2019 at 11:02 am #12024Gary AlbachCVRS Member
I’ve recently completed restoration of a 1933/34 RCA Model 122 in which all the paper capacitors were cryptically marked with only a 5-digit number. The value of the capacitance was not apparent, and the number is not even the RCA part number as per the radio parts list. So, I compiled a table decoding the number on the body of the cap to the actual capacitance, as measured and shown on the schematic. I got some of the numbers from an ARF post; the rest are from the set I just finished.
Gerry O’Hara, our Newsletter editor, will be publishing the table in an upcoming issue, but has suggested that I offer it here as well, as follows:
Marking on Capacitor Body Value
65398 0.05 mfd
68701 0.1 mfd
69037 0.01 mfd
69038 0.005 mfd
69061 0.01 mfd
69074 0.05 mfd
69078 0.025 mfd
69701 0.1 mfd
69702 0.05 mfd
69704 0.05 mfd
69716 0.004 mfd
69723 0.005 mfd
72017 0.05 mfd
73713 0.1 mfd
73716 0.1 mfd
73154 200 pf
73176 900 pf
GarySeptember 15, 2019 at 12:46 pm #12025Sterling SpurrellCVRS Member
Nice job and a great idea that will a lot of time on your repairs. I have it printed off already.September 15, 2019 at 5:11 pm #12026Jean MarcotteForum Participant
Hey! Talk about coincidence. I just bought a 122 two days ago.
JeanSeptember 15, 2019 at 5:58 pm #12027Gary AlbachCVRS Member
Thanks, Sterling. I have attached an image of the table that may easier to read.
Jean, along with the table, I think Gerry may publish photos in the Newsletter of the chassis wiring before and after restoration to show these RCA caps. Will post pictures here of the cabinet when I’m finished. It’s in pretty rough shape so will have to start by stripping it. How much work will you have to do on your 122?
Attachments:September 16, 2019 at 5:14 am #12029Jean MarcotteForum Participant
Thanks for the chart, easier to print. The cabinet has been refinished in the past and is acceptable as is. The chassis is another story. Will need a complete restauration.
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