Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Early Color Television

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 06-03-2018, 05:22 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,607
Smile CTC-5A acquired!...It wants to live.

First off a hardy thanks to Dave for giving me a very good deal/trade on this set.




Originally I only wanted the 21AXP22 from this set, but since Dave was okay with selling the whole set and I like the compact table model cabinet I ended up going for the whole thing.

My plan this morning was to variac it for a laugh (it has an 80's-90's antenna balun on it so I figure it was worth a try), then mercilessly remove the CRT and swap it into my MUCH rarer Motorola 21CT2B (which is more deserving of a 21AXP)...However, it is so close to working properly, that I've decided to delay the swap till I change some capacitors (hopefully that will be done later tonight)...I think it deserves a chance to show a relatively perfect pic at least once on its original CRT before I swap the tube over to the Moto.

The variac got me a raster (20KV HV right off the bat), then video with no synch, then playing with the internal slug and reducing blue screen got me a synched color picture albeit kind of a poor one. This is the oldest color set I've seen give me this good of a reaction to a variac power up in as found condition. I'm surprised and very happy that it has surpassed my expectations.



The original tuning knob was cracked, and I thought I had a replacement. It turns out I had 2, but neither is the exact same color as the original, but they are close enough to not bother anyone. It is interesting that RCA had so many shades of dark brown.


Oh, ya no with a chassis noomber like CTC-5A I'm surprised they didn't make it a Canada only chassis, Eh? Badum tiss.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
  #2  
Old 06-03-2018, 06:35 PM
mbates14 mbates14 is offline
VideoKarma Member
 
Join Date: Apr 2004
Posts: 926
ooooo. Pretty. Only color set I have is my zenith roundy and its in rough rough shape.

Hopefully it comes good! the Flyback is good so thats a plus.
Reply With Quote
  #3  
Old 06-03-2018, 07:28 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 480
Hi Tom,
Glad to see the crt works so well. Don't forget to save all the left over parts after you remove the crt. Never know when you or someone could use them later.
Ed
Reply With Quote
  #4  
Old 06-03-2018, 08:14 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,607
Once I swap the CRT I plan to follow the great instructions in your thread Ed and convert it to a all glass CRT... I'll do my best to make it reversible, and of course keep all the spare mounting hardware with it for the future. You never know when even the most arcaine part will suddenly become needed(though in my experience it is usually within a month of getting rid of it ).
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
  #5  
Old 06-04-2018, 12:53 AM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,607
Changed all the papers on the H and V boards, all the papers under chassis and all but 3 sections of can lytic. It had 2 extra cans zip tied under chassis that I had to re-replace on principle. I also did the vertical lytic, and every can with an obviously dead section. I made sure to change the lytics right off the rectifier too since the power trans has leaked a very noticeable quantity of wax...Much more and I'd have expected it to be bad if I had started the recap before doing the variac power up.

Vert fills the screen and is linear now. Neither of the syncs are as stable as they should be (no change there), monochrome video is weak and color is prone to noise, but it is behaving better overall...I figure once I go over the remaining boards it will be happier.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.

Last edited by Electronic M; 06-04-2018 at 12:59 AM.
Reply With Quote
Audiokarma
  #6  
Old 06-04-2018, 07:05 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 480
Tom,
The power transformer on my CTC5f gets quite hot after about an hour and a half of usage. At the ETF Wayne , old tv nut told me because the transformer is potted it tends to run hotter. I've been operating my set with a voltage regulated isolation transformer.
Ed
Reply With Quote
  #7  
Old 06-04-2018, 07:21 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,607
I finished the recap earlier, and now am sort of satisfied with the picture.


Seems like the alignment is goofy. On rabbit ears and my TX it does not get enough signal to produce sufficient contrast, and chroma is very noisy, it only seems to get sound on the ragged edge of the picture finetuning, and AGC does not seem to do anything. Feeding it directly with a VCR gives plenty of contrast and less chroma noise also optimum chroma, luminance and sound get close enough to have all fairly decent to optimum simultaneously (also the AGC has an effect). Can't totally ditch the chroma noise though (thinking about it maybe the garage fluorescents are interfering).

I think it is about time to harvest the 21AXP22.

Quote:
Originally Posted by EdKozk2 View Post
Tom,
The power transformer on my CTC5f gets quite hot after about an hour and a half of usage. At the ETF Wayne , old tv nut told me because the transformer is potted it tends to run hotter. I've been operating my set with a voltage regulated isolation transformer.
Ed
Good to know. I need to keep an eye out for more of them. I've got 4 but 5 of the 4 are needed by sets (it would be more if I did serious watching on more of my collection).
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
  #8  
Old 06-04-2018, 10:04 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 480
Tom,
Those screen shots look good. The crt I'm using came out of a dumpster set. I can see the difference a good green gun makes. The sound on these set leaves a lot to be desired. The whiter the screen the more buzz. There is a buzz control on the I.F board, it helps a little. The AGC control on my set is able to overload the signal.
Ed
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:40 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.