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Toasted Pre

I have a 220V amplifier (Krell 2250) connected to a 110V pre (Acuphase C2000) and after an year of faithful service the right balanced output from the pre toasted!

I’ve attached some photos of the board so you can see the problem I have here.

http://pbckt.com/sd.d8Vb

It seems I should not have mixed 220V with 110V in the same system.

The technician says it can fixed with parts he can find here but I thought of asking the more experienced...

Best,
gabriel_37
jea48
4,601 posts
 
Gabriel_37,
So much for AGon's history.....

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The preamp did not short out because the amp is fed from 220V and the preamp from 120V, jmho.

You can check the archives here on Agon and AA and find others that have or do the same now. Albert Porter for one, did at one time.
magfan
1,583 posts
 
DO NOT plug the pre back in.....until fixed properly. That board is TOAST.
And, since I see that chip is cracked in half (!!) I'll have to say it was Really Really hot before failure.

Since you had the proper voltages to each piece, I don't think that was the problem.

I don't believe the board can be salvaged.
ghostrider45
449 posts
 
Jea48, Magfan - I concur.

I like the lightning theory.....
gabriel_37 OP
5 posts
 


Friends,

The technician is working, let's wait and see, and hear.
I'm sure he will fix it, not sure what will come out of the pre again...

Meanwhile using a Benchmark DAC as pre.

Thanks for inputs
gabriel_37 OP
5 posts
 
Guys,

I learned from the tech that one of the balanced channels was toasted, the other one is fine, and since the boards are separated and equal, he carefully one was guide to fix the other.

Let's see

Best,
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