This is the 21" Muntz I'm already working on, same as in the commercial
Muntz 2155.jpg
I was able to get a schematic in one of the first 1952 "ET Digest" trade magazines, where about a dozen factory
schematics came folded up in the back every month until the demise of ET/Dealer in the 90s? I have most all of these up to 1977 saved and periodically, they really help clear up any discrepancies found elsewhere.
The schematic for this Muntz was very detailed and gave much information that many other manufacturer's did not supply. It is also in Sam's Photofact with all the part numbers as standard, vital information if looking for parts online not that there are many parts to begin with - LOFL.
Original problem maybe? Testing turned up an open vertical blocking transformer, which I just got a Merit replacement for. Most of the caps were of better quality than RCA and Philco used at the time, especially the electrolytics, which will be replaced anyway. As expected, any bumblebee and wax-paper caps failed as low as 50 volts when tested on my EICO 950. Seeing the Shang066 on YOUtube video with a working set on wax caps was "simply unbelievable" as what MoPar sold in the late 70s
https://www.bing.com/videos/search?q...C079&FORM=VIRE
The other problem was a gassy 20CP4, which I found a 21ZP4B (and correct RCA mask) to replace it, thus eliminating a focus magnet assembly. The replacement is in the box on top.