Vintage Crown D 150A II Amp -- How good was it?

I remember Crown from the old days too. Really well built, meant more for pro use than audiophiles. My recollection was that the company had a religious missionary "mission" and that's why they built tape recorders (don't ask me why, my recollection is sketchy). I rarely saw the tape machines- when I went to studios in those days, MCI was growing in popularity and it wasn't till later that I got to see Studers and all the uber stuff (Yeah, the one Revox was also branded as a Studer, but). 
The amps- I seem to remember liking the SQ of the 150 better than the 300a, but it has been so long. This was around the time I had one of the original Phase Linear 700s- the first model, not the one that looked more like a pinball machine (I remember that the original was thereafter denoted the "A."). It blew up (as those things did), I had the factory fix it- no biggie, and sold it. As I recall, the 400 was a much better sounding amp than the 700. Or maybe I just have a thing for smaller amps. Dunno. Went to tubes by around '73. 
I'm surprised Crown/Harman still supports the old gear, but if they do, that's great. 

Has a Crown D-150 a loong time ago. Probably not very good by today's standards...but its free. The original version had RCA to 1/4" mono phone plug with sometimes poor contact. If the II is the same, be sure to check the cable and phone jack. Also, if it has a hum, an amp this old may need filter caps replaced and it may not be worth it.

The DC300 (or 300A) was often used with the first version of the Infinity Servo-Static 1 (and also the 1A), until the early SAE electronics arrived in the very early 70’s and found favor amongst Infinity dealers. When Audio Research arrived in California, both Crown and SAE were history!

https://www.kenrockwell.com/audio/crown/d-150a-series-ii.htm
This is a great review on the Crown DC 150 A series II

Always recommended/installed Crowns, for road gear/live venues. It was virtually impossible to kill them(rugged as they were, in the late 70’s-early 80’s). I never thought the sound came close, to the home audio amps I carried. Nor did my customers.