Audio amplifier repair, ID caps

Thread Starter

brontozaur1

Joined Apr 12, 2018
12
Hello,
I was recapping an amp and put one beefy 6800uf cap in the wrong polarity. Result - blown amps fuses and blown again when the big caps were installed correctly. It's a simple vintage BW Aura amp so I can replace everything if needed. So far just replacing the diodes and caps that are reading wrong with an esr meter. I want to stick to the original parts as much as possible but I've no clue about the brands of the two caps (pics attached). One 10uf reads 'STABILITY' (is it special in any way??), another is a larger Japan 220uf with a triangle logo on it. Would someone knowledgeable help me to ID them?
Cheers,
https://drive.google.com/open?id=1I2BMwIS1jDXzCwPEXpo_21G05biP4WWj

https://drive.google.com/open?id=1fKNLo8TMz_9aP-RkYaTp36n93CYysuak
 

SLK001

Joined Nov 29, 2011
1,533
IMG_0331.JPG

You have to resample them to a smaller size (your original 1.5MB file was resampled to 1.01MB and it posted fine).
 

SLK001

Joined Nov 29, 2011
1,533
IMG_0332.JPG

I would say the the "STABILITY" marking is just a factory mark to aid the assemblers. Also, the rest of the electros don't seem to have anything special about them, so replace them with QUALITY substitutes.
 

Thread Starter

brontozaur1

Joined Apr 12, 2018
12
I'll do, thanks. Do you think that 6800uf cap can still be fully functional after reversing polarity? It reads pretty normal on ESR meter. It's a good Nichicon 63v audio grade cap, no signs of leakage or anything like that.
 

SLK001

Joined Nov 29, 2011
1,533
I'll do, thanks. Do you think that 6800uf cap can still be fully functional after reversing polarity? It reads pretty normal on ESR meter. It's a good Nichicon 63v audio grade cap, no signs of leakage or anything like that.
No. When you applied power with it in reverse, the current punched thru the dielectric layer, causing all the damage. It might have "self healed", but I would never trust it again.
 
Top