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

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.

 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. 

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. 

@djones51 Thanks very much! 

I have the A90 and it is a workhorse for me. I have been using it recently to break-in new gear. So that means playing it 24 x 7 for a week (no problems). In this scenario I use iPhone ear plugs to output sound. 

When it is not doing break-in work I enjoy the A90 with a Matrix Mini-i 3 Pro DAC using some very old Audience AU24 XLR interconnects. I bought the Mini over the Topping D90 because it was reviewed to be a bit better and also for the incredible ROON streaming options with the Matrix (so no direct computer connection).

I listen to this combo with Meze Empy headphones and it is amazing for the price. This combo comes close to the quality of my Benchmark HPA4 + DAC3B pairing but that combo is much more money.