That is exactly the amp that was popping into my memory as I wrote. Specifically the Phase Linear 400. The PL 700 was a bit more stable. Crown DC300's were also quite popular back then and even though they were more robust, they had their own set of problems that could take out drivers.
Amazing what we had to deal with back then.
Things were A LOT harder back then.
For example all of the amps you listed had UNBALANCED inputs.
Even the "top of the line" processing (BSS-KT etc) had unbalanced XLR outputs.
You had to order the special balanced version to get balanced outputs.
Hum and buzz tracing became an art form-and often times quite a challenge.