RCA CTC38XK Console

[RetroHacker]

I've rescued an RCA CTC36XK console color television recently, and I've been working on getting it going again. It's a rectangular tube color set made in 1969. It has remote tuning with what looks to have been a high frequency sonic remote. (I don't have the hand control). The cabinet is in rough shape, but should clean up OK, and all the knobs are present and accounted for.

On first checkout, all the tubes are present, no nasty looking wires or anything that might catch fire, so I went ahead and brought up the power. All tube filimants light up, including the picture tube, but there is no deflection and no high voltage. There is also no sound. When the volume control is turned all the way up, I get a slight hum, and the hum changes a bit when changing channels, but no television sound or static. The UHF channel knob is frozen in place, and the light bulb for the VHF channel indicator is burned out. On closer inspection, I found that the VHF channel indicator reel is also not moving when the knob is turned. It's stuck on channel 13 (I wonder if that is a sign...).

Anyway, I went down to the main branch of the library, since they have all the Sam's Photofacts, and looked up the folder for this set, only to find out that some previous jerk had stolen the schematic page. I copied the rest of the information in the folder, included the schematic for the hand control. It looks simple enough to build one, provided I can figure out the value of that coil.

My inital instinct is to think that I've got a problem in the sets power supply. A lack of sound along with a lack of high voltage and deflection tells me that I'm missing a critical voltage. The electrolytics don't get warm, but one could still be open. A bad rectifier is also very likely. I pulled the chassis out of the set with a lot of difficulty, the tuner doesn't seem to disconnect easily from the chassis, so it had to come along. The tuner is very heavy and bulky since it has all the remote control motors and such. Under the chassis I found a large ceramic power resistor dangleing out by one lead! The other end looks like it had connected to a terminal strip that has burned and fallen apart, and it is dangleing from some burnt looking wire. I also found a rectifier that looks like it has fallen apart, as one lead can pull away from the disc part!

I'll post pictures when I get a chance, but does anyone have a schematic for this beast? This is the first color set I've worked on, so some of this is new territory.

Thanks!

-Ian