#1
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Acceptable repair?
I'm repairing an el cheapo RCA Victor AM/FM radio from the 60's and I wanted to see if my capactitor replacement idea is okay. It needs a 50MF and an 80 MF. I don't have any that high, so I connected a 47 and a 33 in parallel for the 80, and a 47 and a 10 in parallel for the 50.
Last edited by TUD1; 08-07-2016 at 10:20 PM. |
#2
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It would be better to use a 100 UF and a 47 UF...but your idea will probably work ok.. These are likely just used for filtering...assume this is a hot AA-5 type radio--so a 160 volt cap will work ok.. If a cold chassis--better use 400 volt ones or so..
Last edited by rca2000; 10-07-2015 at 08:16 PM. Reason: add. info. |
#3
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The old one was only for 200 volts, and I guess it worked okay. This is a 6 tube radio with a printed circuit board for a chassis. I just want to get it working good enough to sell at the next swap meat.
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#4
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If it is a 200 volt cap--use a 200 volt or higher one...maybe 250 volt one.
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#5
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The old timers may toss a fit but it will work perfectly fine.
I did a repair much like this when I recapped an old 1946 Arvin radio recently. I had no 40uF caps at 150V on hand, only 22uF caps at 450V, so I just combine two to make 44uF at 450V, works perfectly. |
Audiokarma |
#6
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No need for the 10 in parallel with the 47 (no harm in it either).....47 is close enough to 50 to work fine.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#7
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Well I did the repair, and the radio is dead to the world. Completely silent. Oh well. If I can get $10 for it, I'll be doing good.
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#8
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Quote:
The best hackery, was when the old timers used to carve away, the old-fashioned dog-bone resistors to get the resistance they needed. |
#9
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Quote:
If so, check the B+. Does the set use a silicon or selenium rectifier? If no B+, it could the surge resistor, before or after the rectifier. BTW, did the set hum, before the 'lytics were replaced. |
#10
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May you please post a photo of the radio. I have several 60s RCA Victor radios and my first radio repair ever was on a '62 RCA clock radio with faulty capacitors. Hopefully I can help you and it may turn out that you and I have the same radio!
Sent from my iPad using Tapatalk |
Audiokarma |
#11
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This is what I would say and want to back up because the "rule" is to never go lower than the rated capacitance (or voltage), but if you are real close like that, then I say go for it.
__________________
"Face piles of trials with smiles, for it riles them to believe that you perceive the web they weave, and keep on thinking free" |
#12
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Many electrolytics have a 20% tolerance anyway so it's possible to have 50 that's actually a 40. 47 will be fine although a little higher surely won't hurt either.
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#13
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Cap values have changed over the last few decades...a 50 UF is no longer common. 47UF has replaced it.
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#14
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I measure the caps before I use them to restuff my can 'lytics, with my Chinese ESR meter. A few of my 47's read 46.5.
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#15
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Oh, do tell, what brand of caps are those 47's?
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
Audiokarma |
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