Twitchy RCA CTC17 1966 Screen

[DaveWM]

there are adjustment for vert height and linearty on the back as well as a vert position adj.

There are a lot of things that can go wrong in old tube sets here is a short list:

1) Dirty or worn control pots and switches
2) dirty or loose tube sockets
3) Wires that are stiff and break when moved
4)tubes that are weak/shorted or gassy
5)Capacitors (mainly eletrolytic types in this era) that are going bad
6)resistors that have drifted high or gone low. High is just aging and reg use, low is from a shorted tube or other defect that cause the resistor to get very hot and carbonize.
7)PC boards that are fragile (esp on high hour sets) with broken traces, hack repairs, and crystalized solder on traces and ground stakes
8)film caps, mostly in the sweep circuits that start to act up (can effect both vert and horz, but mostly in vert.
9)Broken coils from ill fated cleaning attempts of the PC board.

all of the above are typical. I suggest you get the volume one RCA color sevice manual a TAB published book by Carl Babcoke. This has a LOT of info on how the circuits work, and covers typical problems found in the field.

http://www.ebay.com/itm/like/1115410...ectorid=229466

this is a MUST HAVE book