2. amps-preamps
  3. 166449-96791

Preamp/interconnects cause amp problems?

My power amp, which sat, untouched for 3 years, always on and sounding great had a short in the power supply (cap gone bad?).

I sent it back to be fixed and and hours after getting back had the same issue. Manufacturer replaced boards and related pieces and is sending back but said they found nothing that they think would cause the issue.

so my concern is it’s something here causing it. Even though the manufacturer put the amp on the burn in rack for a week I’m worried it will have this issue again.

is it possible my preamp or interconnects could cause this? I have a loaner amp in place now for a few months and have had zero issues with it (same everything and save outlet)
but it’s a different (lesser) brand.
gochurchgo
erik_squires
16,058 posts
 
What exactly is going bad?

If it’s the power supply rectifier diodes or caps, it is more likely to be a bad incoming AC problem. If it were an amplifier board going bad more likely a preamp/speaker problem.

Also, exactly what amp is this? Is it DC or AC coupled inputs?


gochurchgo OP
920 posts
 
@erik_squires I honestly have no idea. I asked if I should get a Variac or something and he said no. In fact the tech said he wasn’t totally convinced it was a power issue. I know zero about amp building but that struck me as odd.
Essentially what was happening was, in the middle of the night while the system was off (save for the amp) loud popping sounds we coming from the speakers. I quickly flicked the amp off. It would start again once I turned it on and then 2-3 seconds later speakers popping loudly again.

after I got the amp back the first time the tech said they repaired the short and put it on the rack for a week then booked up a source and speakers and played it Iin the shop for a day. I only got it to play for a few hours before it started again.

it’s headed back to me and though my current amp has been fine I’m worried I’ll have the same issue again.
Post removed 
gochurchgo OP
920 posts
 
@dletch2 he did confirm the issue then repaired what was shorted and sent it back.  When I sent it back again he confirmed it happened again but couldn’t see what the cause was. So he pulled
and replaced the boards and the power supply. I’ve not paid a dime so far and I did offer to pay some shipping but he refused.

I just don’t want this to happen yet again because of something on my end. 
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