Dumont RA-109-A3

[EdKozk2]

Originally Posted by Tom9589

I find it interesting that the Sams for this set doesn't even list a Dumont part number for this capacitor, much less part numbers from other capacitor manufacturers.

Could it have come with the power transformer?

Hi Tom9589,
The transformer was made by SOLAR and the oil filled caps were matched to the transformer. That's why I mentioned the yellow dot color code, which is painted on the transformer and cap. I've been operating the set with the original oil cap so far.
Ed

[EdKozk2]

Originally Posted by Kevin Kuehn

Do you guys feel this application needs an AC motor run type(film in oil) in order to effectively dissipate heat? I was planning to try AC rated film caps and see how warm they get. If not too bad I was then going to try re-stuffing the original can.

Hi Kevin,
I would give it a try and let us know how it works. A while back I tested a Zenith 95-3172 ferro-resonant transformer with film caps and it seemed to work fine. The Zenith was an early 70's color set.
Ed

[Kevin Kuehn]

I didn't mean to imply I was going to get around to trying those caps any time soon. I can't start on yet another project until I finish the dozen or so others projects I have scattered about.

[EdKozk2]

Originally Posted by Kevin Kuehn

I didn't mean to imply I was going to get around to trying those caps any time soon. I can't start on yet another project until I finish the dozen or so others projects I have scattered about.

I hear you, I may catch up with my projects by 2040.

[kramden66]

I had one of these sets , never replaced that cap ,mthey transformer was loud but didn't get hot , used it a lot and no issues , I think it is loud because it is big but that's just my opinion , those who have one can saw if the set they have is loud or wasn't after replacing thr cap.
Could it be replaced with an oil filled type used in transmitters ?

[EdKozk2]

Originally Posted by kramden66

I had one of these sets , never replaced that cap ,mthey transformer was loud but didn't get hot , used it a lot and no issues , I think it is loud because it is big but that's just my opinion , those who have one can saw if the set they have is loud or wasn't after replacing thr cap.
Could it be replaced with an oil filled type used in transmitters ?

I suppose you could use any oil filled capacitor, as long all the specs are correct: 800 VAC or better, non - polarized, 1.75 to 2.00 mfd and the case is isolated. I think your correct about the hum being louder, but the amount of heat the transformer gives off after an hour and a half is what concerns me. The transformer has 39 filaments plus a few dial lights to operate.

[Electronic M]

+b+