1979 RCA Colortrak Console

[radiotvnut]

Probably uses a CTC92 chassis and those could be a pain to troubleshoot. It could be the regulator module, the horizontal module, or anything else in the power supply or horizontal circuit. Before you get carried away with repairing it, I'd check the CRT. Those late '70's delta gun RCA tubes were not that great and most of the ones that I find are either weak or shorted.