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  #1  
Old 12-29-2018, 02:55 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, 02:58 PM
ZenithNut ZenithNut is offline
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Photos
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File Type: jpg 20181229_111605.jpg (87.3 KB, 77 views)
File Type: jpg 20181229_111441.jpg (92.8 KB, 77 views)
File Type: jpg 20181229_111550.jpg (75.8 KB, 72 views)
File Type: jpg 20181229_111515.jpg (53.2 KB, 76 views)
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  #3  
Old 12-29-2018, 03:17 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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  #4  
Old 12-29-2018, 03:43 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, 04:02 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 04:20 PM.
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Old 12-29-2018, 04:49 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, 05:05 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, 05:05 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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  #9  
Old 12-29-2018, 05:12 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, 05:18 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, 05:20 PM
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Originally Posted by ZenithNut View Post
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 05:25 PM.
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  #12  
Old 12-29-2018, 05:29 PM
ZenithNut ZenithNut is offline
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Zenith nut, Not to overstay my welcome, but here is the tube layout for the CM CMC-20 chassis.
No stay as much as you can! Just looked at whats left of the tube chart on the hv cage and it calls for a 1v2 focus rectifier not a 2av2 listed in the cmc20

Rca ctc 16 uses a 1v2

Last edited by ZenithNut; 12-29-2018 at 05:33 PM.
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  #13  
Old 12-29-2018, 05:57 PM
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Originally Posted by ZenithNut View Post
No stay as much as you can! Just looked at whats left of the tube chart on the hv cage and it calls for a 1v2 focus rectifier not a 2av2 listed in the cmc20

Rca ctc 16 uses a 1v2
I noticed the CTC-16 as I posted. And the different focus tubes as well. Perhaps a production change on the layout chart. The tube complement list also has the 2av2 listed. Checked my RCA reference book and the 1V2 & the 2av2 are not listed as interchangeable. I have no experience w/these "later" model roundies. I would suggest that you repost or re-ask your questions to VK. Plenty of folks w/CTC-15's and if you're lucky a CM clone.

Best in the new year,

-Steve D.
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Last edited by Steve D.; 12-29-2018 at 06:01 PM.
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  #14  
Old 12-29-2018, 08:04 PM
ZenithNut ZenithNut is offline
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Originally Posted by Steve D. View Post
I noticed the CTC-16 as I posted. And the different focus tubes as well. Perhaps a production change on the layout chart. The tube complement list also has the 2av2 listed. Checked my RCA reference book and the 1V2 & the 2av2 are not listed as interchangeable. I have no experience w/these "later" model roundies. I would suggest that you repost or re-ask your questions to VK. Plenty of folks w/CTC-15's and if you're lucky a CM clone.


Best in the new year,

-Steve D.
Where in videokarma should I repost this?
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  #15  
Old 12-30-2018, 12:20 AM
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Where in videokarma should I repost this?
Hey Alex, I just now returned to my computer. I suggested VK color tv section as you did before. However, you did fine logging on to The Vintage TV Collectors site as well. I read your inquiry about the blue lateral magnet. You received the proper response. Hopefully you'll find the original or a good replacement. I also hope you received a reply on the hor osc coil. I'll look forward to viewing your progress on the CM.

Best,

Steve Dichter
Stevetek@webtv.net
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