This "breakout box" for checking operation of 21" round CRT can be useful.
This is not my item, and i don't know the seller.

http://cgi.ebay.com/Anchor-KINE-COLOR-CIRCUIT-ANALYZER-Model-CA378-TV_W0QQitemZ270007038090QQihZ017QQcategoryZ73173QQ rdZ1QQssPageNameZWD1VQQcmdZViewItem