Curtis Mathes Color Roundie ID

[ZenithNut]

Hello,

Last night I dragged home a CM roundie. Theres not a lot to go on with it. Most the tubes are CM branded with date codes of XX-65. Has a RCA Hi lite 21FBP22A crt in it. Theres a chassis # of C20-1j i think it is. I will try to upload photos here. I may have to resize them. Maybe a CTC-15 clone?

[ZenithNut]

Photos

[ZenithNut]

Front. A bunch of the controls like tone are sorta hidden under the bottom 3 controls

[Tony V]

It's definitely a RCA clone. The type Horizontal, damper and vertical output tube will determine whether its a CTC12, 15, or 16 chassis clone. I'm leaning towards it being a CTC15.

[ZenithNut]

Tony the damper is a 6dw4. Hor and vertical are 6fq7 and 6gf7. 1av2 focus rect. Should I try to get the sams for a ctc 15/etc or for this set specifically?

Also the diode bridge is mounted on terminal strips under the chassis, not on the pcb.

I downloaded the sams for rca ctc 15 off the early television museum. Looks really similar except the CM uses a tube focus rect and the rca ctc 15 uses a diode.

[Steve D.]

Originally Posted by ZenithNut

Tony the damper is a 6dw4. Hor and vertical are 6fq7 and 6gf7. 1av2 focus rect. Should I try to get the sams for a ctc 15/etc or for this set specifically?

Also the diode bridge is mounted on terminal strips under the chassis, not on the pcb.

I downloaded the sams for rca ctc 15 off the early television museum. Looks really similar except the CM uses a tube focus rect and the rca ctc 15 uses a diode.

Originally Posted by ZenithNut

Tony the damper is a 6dw4. Hor and vertical are 6fq7 and 6gf7. 1av2 focus rect. Should I try to get the sams for a ctc 15/etc or for this set specifically?

Also the diode bridge is mounted on terminal strips under the chassis, not on the pcb.

I downloaded the sams for rca ctc 15 off the early television museum. Looks really similar except the CM uses a tube focus rect and the rca ctc 15 uses a diode.

Zenith nut, You are correct about the diode in the RCA. Here is the RCA CTC-16 tube listing which is similar to your CM model.

[ZenithNut]

Originally Posted by Steve D.

Zenith nut, You are correct about the diode in the RCA. Here is the RCA CTC-16 tube listing which is similar to your CM model.

I think I have a lead on the sams for this CM. Sams 831-2 but im not gonna fork up $22 bucks until I know thats what is.

[Steve D.]

Zenith nut, This page on CM CTC-15 clones may also be of interest to you:

[ZenithNut]

Originally Posted by Steve D.

Zenith nut, This page on CM CTC-15 clones may also be of interest to you:

Thats it. A CMC 20. Sams 831-2. Thanks!

[ZenithNut]

Originally Posted by Steve D.

Zenith nut, This page on CM CTC-15 clones may also be of interest to you:

Steve, the hor osc coil broke. Can the little red wire be soldered together and repaired? It broke at the base. The core is intact. I have a soldering station with a thermostat for the iron.

[Steve D.]

Originally Posted by ZenithNut

I think I have a lead on the sams for this CM. Sams 831-2 but im not gonna fork up $22 bucks until I know thats what is.

Zenith nut, Not to overstay my welcome, but here is the tube layout for the CM CMC-20 chassis.

[oldtvman]

I always had to laugh at some of the clone sets like CM and Sears. On that set the picture tube bezel is plastic vs metal on the name brands. I'd always heard that Sears did that on lots of stuff they sold.

[Charlie]

I have a couple of Curtis Mathes C-20 sets. You will find the chassis has characteristics of both the CTC-15 AND CTC-16.

[old_coot88]

If it has auto-degauss, that would make it closer to a '16.

[dieseljeep]

Originally Posted by Charlie

I have a couple of Curtis Mathes C-20 sets. You will find the chassis has characteristics of both the CTC-15 AND CTC-16.

The last CM roundie was a knockoff of the cheapie RCA CTC20. 6GH8's galore.
Slight difference, it used the lousy 6KM6 horiz out.