Hi I've found locally a phase linear 400 that has been serviced for 350 and a Fisher 400c for 450 with wood case that is working except for the FM radio. Is the phase linear worth 350 considering its been worked on and is up to spec? Also, I the buyer won't allow me to test the 400c because of covid but he says I can pay 200 upfront and the rest after I test it. The 400c has a couple other minor issues and at first I thought this was a great deal but I'm having doubts. I'm a collector and I'm just interested in people's opinions on whether this is a good deal or not. Also if anyone has an opinion on phase linear and whether its an amp.worth having in my collection. Any opinions are appreciated.