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Re: Has anyone rebuilt an ARC SP3A power supply?

Posted by AJ (A) on April 8, 2007 at 16:25:20

In Reply to: Has anyone rebuilt an ARC SP3A power supply? posted by Tromatic on April 8, 2007 at 13:05:21:

Hello,

I have refurbed an SP-3A-1 power supply. I bought the pre used and I believe there are 5-6 capacitor cans in this unit. The one I purchased was missing one can and some of the others showed high ESR.

The values of these cans are no longer commercially available, so ARC re-vamped the PS to accomodate newer style radial caps and included a muting circuit in its update (for a $1000!) of this unit.

I ended up restuffing each can with computer grade cornell-dublier 105 degree C caps. Replaced the leaking pass transistor and all the zeners and resistors on the board. It is indistinguishable from stock.

Works like a charm and my unit is easily a 9/10 or better cosmetically...so it turned out quite well.

If you're good with tools and can read a schematic it can be done...a lot of work but worth it..

AJ

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