Cost of fitting new PSU caps to Power amp

[halvis]

I am interested in buying a Conrad Johnson MF2500A power amp second hand.

The seller says the PSU electrolytic capacitors used in the PSU will soon need replacing.

He believes there are six of them - 10,000mF Nichison's (he doesn't have voltage details).

Just wondering what sort of price it would be to get these replaced and the unit tested?

thanks.

 

[Hazelberry]

The cheapest way is find out the voltage and buy the model or equivalent at the big electronic suppliers like Mouser and Farnell/Element21. Install them yourself if you have soldering equipment and confidence.

 

[halvis]

In theory, I probably could do it myself, but not sure I would have the confidence. So would probably rather pay someone to do it.

 

[Gervais Cote]

The capacitors should be around £15 max each and it should be a 2 hour job by looking at the inside of the amplifier as can be seen here:

https://www.canuckaudiomart.com/details/649568537-conrad-johnson-mf2500a/images/2473257/

Easy to perform by any electronic technician. I would go up to next voltage up if I was to replace them myself as they will last longer, as long as they are not too big to fit in.

 

[sq225917]

You'll find caps have shrunk since that was made, so getting larger capacitance in higher voltage and better temp rating will be easy. I'd expect £8-15 each depending on voltage

 

[JimmyB]

https://www.conradjohnsonowners.com/viewtopic.php?t=1118

Looks like there's room for even more in there but 10000 or 12000uF @ 80V seem to be the way to go?

 

[Gervais Cote]

The original ones were probably 10000 uf but 12000 uf would be fine. I wouldn’t go higher than that as it probably won’t make any difference.
I usually prefer a 10000 uf with very low ESR rather than a higher capacitance with higher ESR.

 

[halvis]

Thanks for this, sounds like about €300 should sort it then which isn't too bad. I may as well put the longer lasting caps in as well for the little extra.

 

[Mynamemynaim]

Bit strange for it to burn out like that...and even stranger to carry on like nothing has happened to it ?
Guess you were both luck and unlucky..at the same time

 

[halvis]

Actually, it isn't mine, it is one I am thinking of buying. The buyer says its working perfectly, but has been told that if they are not changed soon something very bad could happen.

I am undecided whether I will proceed at this stage.

 

[mansr]

Actually, it isn't mine, it is one I am thinking of buying. The buyer says its working perfectly, but has been told that if they are not changed soon something very bad could happen.

I am undecided whether I will proceed at this stage.

Add £100 to the asking price and decide if you still want it. Or negotiate a lower price.