A few notes.
How do you service it ? Almost impossible ! My boss couldnt say
no to anything. There were still some floating around in the early 70's
and he refused to work on them. I dont know how RCA & others
built sets like this. Manuals said to cut out or crush then they had little
spring like things to make the connection.
Video detector diodes were troublesome up till the mid 60's. Often gave
odd symptoms so if any question just change the damn thing. When
built into a can often the can had a 2 piece shield & the top pulled off
so look for that.
BTW tube testers are almost a bigger liar than a politician. A known good tube
is the only way to be sure. We had a TOTL B&K & never used it. It was
for the customers & the biggest obscene profit maker in the shop.
73 Zeno
LFOD !