Quote Originally Posted by Feanor
I had a Phase Linear 400 which used daily for 25 years with no problem other than that the meter laps burned out.

As I've always understood, the repairs are a result of abuse, most often driving them too hard and long without adequate cooling -- contrary to Phase Linear's specific advise.
I used Phase Linear amps for many years in Pro Sound with excellent results as well as home audio.

Companies like Clair Brothers Audio built the largest touring sound/lighting companies on the planet using unreliable Phase Linear 700's back in the 70's, 80' and into the 90's.

Good thing they had the brains to ensure proper air flow in the racks - would have been a shame to have Sammy Hagar shut down in the middle of Heavy Metal on the VOA tour.

The model 700 series 2 amps that were custom built for Clair Brothers Audio had to spec a minium of 700 RMS per channel @ 4 ohms, both channels driven.

Here's a picture of one that survived the massive failures/burndowns they were "Known" to suffer. I am pleased to say, it's in my home audio inventory.

And yes to the naysayers - if you starve them for air - they will readily fry.