How does the Phase Linear 400 compare?

MidFi, noisy, & not too reliable in my experience - but the guy that I sold it to 20 years ago still uses it; with periodic board contact cleanings it keeps running somehow. I liked the autocorrelator & dynamic expander enough that I picked up a model 1000 which replaced only those functions, but it's been on the shelf now for about 5 years. I should sell it.

Agree with Bob. Basically a vintage boat anchor, that does have some sentimental value to some, and can be sold for a decent buck. Do it while it still works.

Although in my opinion, it can not compete with current low-budget amps, I have heard quite a few and tried to help friends with different problems with this one. Again, the important thing is, if you like it, it does not matter at all what anyone else thinks.

I was a proud owner about 25 years ago. I actually sold a Mac 275 tube amp for it. (I know, I should be horse whipped for that audio stupidity.)I was in love with power at the time.

I remember that period in time very well. Amps were going for power and very low IM and THD distortion values. A Finish engineer by the name of Otela came up with a new measurement about then called Transient IM distortion. This was the first insight into why tube amps actually sounded better than solid state amps, like the PL and Crown DC300.

You could call the Phase Linear 400 one of last of the high TIM beasts. I can remember listening to them. They sounded impressive with all that power but when the music got loud they turned diamand hard.