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Topping A90 failure issues. Should I try a 3rd A90?

I purchased the Topping A90 & D90 MQA August 2020. The A90 lasted about 3 months then "blew up" with major static in one channel. I tried different headphones, connects (4 pin XLR, 4.4mm pentacon) and it was in fact the A 90. Apos exchanged the failed A90 (took a long time) and after using the 2nd A90 for less than a month, the same issue. So after 2 failed A90's I'm wondering if I try a 3rd or another headphone amp? I'm using XLR balanced (and have 2 headphones that are also balanced cables). Thanks for any counsel. 
128x128dreas
dreas's avatar
dreas OP
86 posts
 
@djones yes. I purchased them from Apos as part of their bundle with the A90 & D90.

atmasphere's avatar
atmasphere
11,615 posts
 
But this is different. After a loud static discharge, one channel went out.
Sounds a bit like an opamp failure. And really bad luck, considering how well the unit measures.
soix
8,765 posts
 
 Very strange.  If there weren’t viable competitors I’d consider trying a third A90, but there certainly are and it seems for whatever reason the Topping’s not working in your system.  If it’s me, at this point I’d shell out an extra $100 and try the Singxer SA-1, which may actually be an even better amp.  Just my $0.02, and best of luck whatever you decide. 
djones51
4,947 posts
 
You might try posting a question on ASR. John Yang is the user you would want to contact I believe he works for Topping. I know there are a couple of threads where some problems with the A90 are discussed one thing he mentioned was a bad XLR cable can be a cause. 
dreas's avatar
dreas OP
86 posts
 
@djones51 Thanks very much! 
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