337alant
Negatively Biased
I'm sure what you are saying is good advice, but as I said I have been using different versions of these amps for over 10 years @ 53v rails and all has been well and I have never had one blow up like that?, I'm sure many others will agree with me hereIt's nothing to do with bias or heatsinking! It's due to lack of SOAR for the output devices as explained above and ANY AND ALL amplifiers using a single pair of bipolar output devices on rails of 50V plus and no current limiting/protection will be equally prone to such blow ups.
Stick to a max of 40V rails and all should be well.
There will always be failures with DIY builds but there is nothing wrong with these amps and they are not unreliable as you stated ?IMHO.
I do use speaker protection
Alan