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-   -   Curtis Mathes Color Roundie ID (http://www.videokarma.org/showthread.php?t=271199)

ZenithNut 12-29-2018 01:55 PM
Curtis Mathes Color Roundie ID
 
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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 12-29-2018 01:58 PM
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Photos

ZenithNut 12-29-2018 02:17 PM
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Front. A bunch of the controls like tone are sorta hidden under the bottom 3 controls

Tony V 12-29-2018 02:43 PM
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 12-29-2018 03:02 PM
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. 12-29-2018 03:49 PM
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Quote:
Originally Posted by ZenithNut (Post 3206985)
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.
Quote:
Originally Posted by ZenithNut (Post 3206985)
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 12-29-2018 04:05 PM
Quote:
Originally Posted by Steve D. (Post 3206988)
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. 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:

ZenithNut 12-29-2018 04:12 PM
Quote:
Originally Posted by Steve D. (Post 3206990)
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 12-29-2018 04:18 PM
Quote:
Originally Posted by Steve D. (Post 3206990)
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. 12-29-2018 04:20 PM
1 Attachment(s)
Quote:
Originally Posted by ZenithNut (Post 3206989)
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.

ZenithNut 12-29-2018 04:29 PM
Quote:
Originally Posted by Steve D. (Post 3206994)
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

Steve D. 12-29-2018 04:57 PM
Quote:
Originally Posted by ZenithNut (Post 3206995)
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.

ZenithNut 12-29-2018 07:04 PM
Quote:
Originally Posted by Steve D. (Post 3206996)
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?

Steve D. 12-29-2018 11:20 PM
Quote:
Originally Posted by ZenithNut (Post 3206998)
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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