2. amps-preamps
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Shorting Amplifier Output

I moved my speaker and the speaker wire dislodged from the speaker lug causing it to short to the opposing side of the speaker lug. I have a Unison Research Unico Secondo. I noticed this when I started smelling a burning odor. Is it possible to repair, and is it worth it to repair? Are their any service places local to the Los Angeles area?
timyamasaki
6 responses Add your response
georgehifi's avatar
georgehifi
10,312 posts
 


At a guess you’ve blown some output transistors, drivers and emitter resistors, $100 approx parts.
Looking at the dismantling layout, they didn't make it easy, the whole board has to come out. A good 4hrs labour, $400+ approx, in Australia some charge $150aud pr hr

https://www.hifisentralen.no/forumet/attachments/d652efdbaf5de7acb016cfb15c7350e9-jpg.619705/

https://www.hifisentralen.no/forumet/attachments/26d69d1d38275e8c54ccc5e8c030d563-jpg.594604/

https://www.hifinews.com/images/419unison.top.jpg

Cheers George
atmasphere's avatar
atmasphere
11,834 posts
 
Is it possible to repair, and is it worth it to repair?
I'm going with yes. Whether there is someone in LA is a different matter, but I'd be a bit surprised if there wasn't, its a big town!
timyamasaki OP
10 posts
 
Thanx for the responses. That would be around $400 - $450 in US dollars including parts. I paid a little over $2k for the Integrated Amp 16 years ago. I love the sound and want both channels to match, but I don't want to drop it off anywhere that isn't a preferred dealer or repair shop for Unison Research.
atmasphere's avatar
atmasphere
11,834 posts
 
I don't want to drop it off anywhere that isn't a preferred dealer or repair shop for Unison Research.
You're not going to find one of those on every block of even in every town. Unless there is really something peculiar going on, any competent tech should be able to sort it out. If they ground the part numbers off the transistors then it will be a problem...
timyamasaki OP
10 posts
 
I was quoted between 600 and 900USD.
atmasphere's avatar
atmasphere
11,834 posts
 
That might be reasonable depending on what a new one might cost.
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