Its the last delta tube set & the last modular RCA. I saw
very few of them. We did tons of RCA so that means they are
rare or very reliable or both.
The set uses an SCR for a regulator & can be a bitch to fix requiring
all the equipment ( meter, scope, variac, DC power supply ) also
knowledge & patience.
The power supply, horz osc & HV all have to be working or you get
"dead set". There is also a one chance kick start for the horz osc.
to spice things up !
If you look at it & dont hear the quick degauss hum at cold turn on
it may be just the main fuse. ( 7 A fast blow)
73 Zeno
LFOD !