Since they haven't been turned-on in years I recommend using a VARIAC to slowly bring up the AC voltage (over,say, a 12 hour period) to avoid stressing the power supply caps in both the pre and power amp. And yes, the 400 does have a reputation for troublesome behavior - I have one myself (though not in present use). Good luck!
Hooking up my phase linear model 2000 preamp, to my model 400 main amp.
I had these two units for years,hooked them up back in 2001,found they needed some work, had them repaired they have sat in the shipping box ever since. I did hook then up years ago but don't remember how I did it. Now I have them again, and want to get them going . And don't want to burn something up hooking them up wrong. Can someone give me some direction how to do this. Thanks DRW.