Those diodes are probably good. If you are using a digital meter, check them on the diode scale. The likely problem is the chopper transistor (mounted on a heatsink) in the power supply. This transistor likely took out the control IC. In addition, replace the electrolytics in the switching circuit. 39uf, 2.2uf, 15uf, and 470uf. They are all located right there around the IC and transistor. And, check the horizontal output transistor for shorts. It's on a big heatsink close to the flyback transformer.
BTW, don't use NTE, ECG, or any Chinese knock-off parts in this application because they likely will not hold up. Use original RCA parts if possible.
www.tritronicsinc.com should have the parts.
IMHO, the CTC169 was the best Thomson era RCA chassis made.