Philco 48-2500 Projection Set; RCA 621TS

Just picked this up--in fact, it's still in the car until I get a helper--for $125 (OK?) and save for a few surface scratches, it's in beautiful shape. Was in the seller's mother's home since the early 50's when her sister gave her the set. He stated that it hadn't been used since the 70's (electrolytics needed) but that it was working fine at the time. Looked pretty straightforward inside, but is there any cautionary information you'd like to pass on? I presume there's a catioptic mirror in there that you don't touch with sweaty fingers but any info that's helpful or useful with regard to proj sets would be appreciated. TP400 CRT's impossible to find? This one might be weak.

By the way, the two 621 backs I got from Amptech are outstanding and presumably, the quality extends to their other repros as well!

Thanks!
Michael Hagan