I bought a 4k2d from Rab. I ran the amp for 2 days on the 3rd day the amp went up in smoke. RAB assured me the amp had not been repaired prior. I sent the amp to DBR who says otherwise
DBR said and I quote
dB-r Customer Service
10/12 15:39 Looks like we can fix it. Power Supply is blown to hell, someone else had previously worked on this amp and looks like they did not properly secure the power supply mosfets to the heatsink, so they did not transfer heat properly so it blew them up when the mosfets overheated. I am short 1 mosfet of having all of the parts, at least that is how it looks at the moment will check again.
Will be $250 + return shipping, how soon are you going to be ready for it?
B-r Customer Service
10/12 15:54 Someone had taken it apart and put it back together, at a minimum, maybe they did not repair it, but they put it back together incorrectly, it does not look like something the factory would have done, it had long screws with nuts on them to hold some of the mosfets down and they were not tight.
I have attached pictures that DBR took while he was doing the repairs.
RAB offered to pay for 50.00 of the 287. I had to spend. when I asked for more he simply did not reply. Its worth more than 50 to make sure he never does this to someone else.