DC issues using a Krell KSA 150 w/ tubed preamp?

Atmasphere explain that to C/J. I just got done working on a Prem140 that had Polystyrene film caps at the input and output of a 440Vdc regulated power supply. Every single semiconductor device including 15 zener diodes failed dead short because one of those film caps instantaneously shorted and healed. I've also had to replace coupling caps in McIntosh and Dynaco amps and preamps due to either shorted or leaking coupling caps. It happens far more often than you think, especially in older gear.

Polyglot I am a tech and a Warranty Repair Station for ARC. The caps that failed in the C/J were C/J's own branded polystyrene caps. I'm sure they were not made by them. Their tech advised me that this series cap do indeed short and then heal themselves. Their update includes removing all those particular caps from the amp and replacing them with updated parts. I would contact C/J and ask them. My friend and great guy Ed who worked their for decades, retired and no longer works there in customer support. I don't know if you will be able to get any information from them.

Thanks Polyglot. I was unaware they hired someone new.