Identifying vintage electrolytics 1950's

[Pauld35]

hello Im trying to identify these two caps. the battery is a normal 9v for scale. not sure of the voltage of the top cap if it is 12v 5wv or if it is rated for 125v and do not know the capacitance and voltage rating of the smaller cap, it is hard to read the stamp, it looks like is say 1000f 3v the 2nd photo is for the reading from the 2nd smaller cap. it could be way out. hoping someone is familiar with working with these style of caps,

thanks

 

[Monte McGuire]

The marking "12,5" means 12 and a half volts - comma replacing decimal point is common in Europe.

As for the second one, I'm at a loss - too hard to see.

 

[Pauld35]

The marking "12,5" means 12 and a half volts - comma replacing decimal point is common in Europe.

As for the second one, I'm at a loss - too hard to see.

awsome thanks, they come out of a Philips Holland record player, maybe someone from holland will know the second one

 

[Diabolical Artificer]

2nd cap looks like 1000u 3v as you say. As it's a Philip's record player these are probably Philip's caps, some version's have a blue plastic sheath. A look on the schematic should reveal exactly what value the caps should be.


Andy.

 

[Pauld35]

2nd cap looks like 1000u 3v as you say. As it's a Philip's record player these are probably Philip's caps, some version's have a blue plastic sheath. A look on the schematic should reveal exactly what value the caps should be.


Andy.

cheers i just checked its a cathode to ground on a ecc83, seems pretty high value? thinking it might be a 100 uf 3v because its about third of the size and voltage of the larger one

 

[Kay Pirinha]

Yes, 100 µF 3 V is clearly recognizable .
Best regards!

 

[Diabolical Artificer]

100u makes more sense, looking again I mistook the "u" for a 0, what's the cathode resistor? 1k/1k2?


Andy.

 

[Pauld35]

100u makes more sense, looking again I mistook the "u" for a 0, what's the cathode resistor? 1k/1k2?


Andy.

same, would have thought 100uf first off except it was read 272 uf.
Was thinking an old cap on the way out would lose capacitance.

Found another the same that said 100 uf 3v it read 274 uf,
the Rk is 2k2

 

[indianajo]

100 uf was a generous (lots of bass boost) cathode bypass cap. Lots of hammond organs used 25.
Old electrolytics do go high value sometimes. Coupled with high ESR usually.

 

[PRR]

> Was thinking an old cap on the way out would lose capacitance.

When an old e-cap sits without voltage for many years, the dielectric layer gets thin. Naturally the capacitance goes UP. If you again put voltage on it, the high leakage current either re-forms the dielectric layers, or causes the cap to blow-up. I would not bother re-forming a cap that has got that thin. But the high uFd is not a mystery.