I took them both to a tech. BOTH had the buffer board wired incorrect and smoked the amp module..
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I went over the schematic after the tech, to make sure.
The nitwit in Perth had wired in a dual single OpAmps after market board in. He didn't remove the old OpAmps he left them in place and wired the option board (that was socked) along with the NECs in series.
POW!!
The whole time I'm waiting on a case base mounting plate because BOTH cases got tweaked during shipping. That takes 2 more months. Australia has some of the highest shipping cost in the world too. ZERO in the way of legal recourse. 5K for the Yankee to open a case against a LOCAL for a 3K claim.. Justice? Now you know WHY it was a penal colony. Still is as far as I'm concerned!
Next stage:
I get hold of Andrew at Sparko Labs and that started my real journey with Sparko and Nord in the Class D world. I learned quite a bit and I got the boards replaces by the owner at Nord.. I tossed the guy transformers, case and crap he added (Perth puke). Then went with the new modules, the largest switching power supply they had at the time, Nords rev. D buffer boards and cases from China (:-)).
NC500 what a little workhorse. I have 1 triple and 3 pairs of mono blocks all but one rev. D boards. WHY! Horse trading. Need a Nord? I got a few.. LOL
Time for my OCD meds. :-) I love electroshock therapy after my morning coffee, makes me want to chase a nurse or two.. Other than slobberin' a little bit and forgetting who I am, I do fine!!
I'm suppose to do something.............. OH feed the chickens..
Regards