I’ll be honest. He rattled off a bunch of technical stuff that I couldn’t follow about the power section being faulty and unreliable with these heads. He said he’d fix it but it would just happen again when I pushed it.
I guess he didn't fix it then, did he? Guy sounds like a rookie.
The issues are well-documented, and if he was competent, he should have told you what the fix was, or fixed it. For all you know, it was just bad power tubes. Some of these have bias drift, and I've owned 4 DSL's from '98 to 2003, and never had a problem. They were all 50 watters.
Bad layout.
I mentioned intermittent crack based on a funny story - funny in hindsight.
Back when it was all hand taping to lay out traces a buddy was working
on a pretty large ground plane and didn't have a long enough piece of tape
to finish it and chose to try and mate two pieces instead of the obvious.
He's looking at the film over a bright light convinced the patch was fine
while I'm shaking my head no no no.
Sure enough when the board got too hot small cracks would happen.
Didn't get caught until mass production.
1K pcbs needed to be hand reworked and a customer order was delayed in the process.
He was fired as soon as the root cause was revealed.
