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  #1  
Old 12-29-2018, 01:55 PM
ZenithNut ZenithNut is offline
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Curtis Mathes Color Roundie ID

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?
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File Type: jpg 20181229_111436.jpg (49.4 KB, 65 views)
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  #2  
Old 12-29-2018, 01:58 PM
ZenithNut ZenithNut is offline
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Photos
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File Type: jpg 20181229_111452.jpg (103.6 KB, 85 views)
File Type: jpg 20181229_111605.jpg (87.3 KB, 79 views)
File Type: jpg 20181229_111441.jpg (92.8 KB, 79 views)
File Type: jpg 20181229_111550.jpg (75.8 KB, 74 views)
File Type: jpg 20181229_111515.jpg (53.2 KB, 78 views)
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  #3  
Old 12-29-2018, 02:17 PM
ZenithNut ZenithNut is offline
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Front. A bunch of the controls like tone are sorta hidden under the bottom 3 controls
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Old 12-29-2018, 02:43 PM
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Tony V Tony V is offline
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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.
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Old 12-29-2018, 03:02 PM
ZenithNut ZenithNut is offline
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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.

Last edited by ZenithNut; 12-29-2018 at 03:20 PM.
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Old 12-29-2018, 03:49 PM
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Quote:
Originally Posted by ZenithNut View Post
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.
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Originally Posted by ZenithNut View Post
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.
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File Type: jpg RCA CTC-15 tubes (1).jpg (99.6 KB, 24 views)
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Old 12-29-2018, 04:05 PM
ZenithNut ZenithNut is offline
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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.
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Old 12-29-2018, 04:05 PM
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Zenith nut, This page on CM CTC-15 clones may also be of interest to you:
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File Type: jpg RCA CTC-15 tube #2 (1).jpg (97.0 KB, 38 views)
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Old 12-29-2018, 04:12 PM
ZenithNut ZenithNut is offline
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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!
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  #10  
Old 12-29-2018, 04:18 PM
ZenithNut ZenithNut is offline
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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.
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  #11  
Old 12-29-2018, 04:20 PM
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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.
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File Type: jpg CM tube chassis (1).jpg (73.4 KB, 35 views)
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Last edited by Steve D.; 12-29-2018 at 04:25 PM.
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  #12  
Old 01-09-2019, 03:22 PM
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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.
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Old 01-16-2019, 08:23 AM
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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.
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  #14  
Old 01-16-2019, 11:57 AM
old_coot88 old_coot88 is offline
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If it has auto-degauss, that would make it closer to a '16.
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Old 01-16-2019, 12:14 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by Charlie View Post
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.
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