Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Early B&W and Projection TV

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 08-12-2017, 01:01 PM
Crist Rigott Crist Rigott is offline
VideoKarma Member
 
Join Date: Oct 2015
Location: Waxahachie, TX
Posts: 834
RCA T-121 Restoration

I have a RCA T-121 chassis #KSC34C. I'll be doing a restoration on this TV in the future. However it needs a back.

1. Does anybody have one to sell?

2. Can anybody take a picture straight on with a ruler so I can draw one up and make one. I assuming that it is made from Masonite.

Thanks.





Reply With Quote
  #2  
Old 08-12-2017, 07:27 PM
jr_tech's Avatar
jr_tech jr_tech is offline
VideoKarma Member
 
Join Date: Sep 2009
Posts: 3,478
Those sets had backs ????

I don't know about t121s, but I have seen a fair number of t120s (mine included) and have never seen a back on one.
I always suspected that the sets ran quite warm with the back on, and that they were often removed and thrown away fairly early in the set's life.

Question... how does the 121 differ from the more common 120?

jr
Reply With Quote
  #3  
Old 08-12-2017, 07:35 PM
benman94's Avatar
benman94 benman94 is offline
Super Moderator
 
Join Date: Jun 2011
Location: Detroit, MI
Posts: 695
My T-120 had a back. I trashed the set though after restoration; it seems a fair number of the T-120s and T-121s are incapable of adequate horizontal linearity. Mine was among them...
Reply With Quote
  #4  
Old 08-12-2017, 08:38 PM
decojoe67's Avatar
decojoe67 decojoe67 is offline
VideoKarma Member
 
Join Date: Apr 2011
Location: Long Island, NY
Posts: 731
It's commonplace for backs to be missing on early TV's. Often it was suggested to allow for better cooling. I found some nice selections of perforated sheet metal on eBay that worked very well to make backs for two Admiral TV's. I've seen them made from sheets of Masonite too, but it requires more work to make the cooling holes/slats. I agree that your RCA likely used masonite, although metal was used on the earlier models. The worst choice is peg-board in my opinion. It always looks cheesy.

Last edited by decojoe67; 08-12-2017 at 08:41 PM.
Reply With Quote
  #5  
Old 08-12-2017, 09:30 PM
old_coot88 old_coot88 is offline
VideoKarma Member
 
Join Date: Sep 2009
Posts: 1,826
Quote:
Originally Posted by benman94 View Post
...it seems a fair number of the T-120s and T-121s are incapable of adequate horizontal linearity. Mine was among them...
Dang. I battled H. linearity one of these back in the day, and could never fix it. Phil Nelson had one more recently with the same problem. Seems to be the nature of many if not all of this particular series.
Reply With Quote
Audiokarma
  #6  
Old 08-12-2017, 09:37 PM
benman94's Avatar
benman94 benman94 is offline
Super Moderator
 
Join Date: Jun 2011
Location: Detroit, MI
Posts: 695
Quote:
Originally Posted by old_coot88 View Post
Dang. I battled H. linearity one of these back in the day, and could never fix it. Phil Nelson had one more recently with the same problem. Seems to be the nature of many if not all of this particular series.
With your post I now know of at least six people that fought one of these sets and lost... and none that have figured it out. I finally concluded mine likely rolled off the line with p*ss poor linearity.
Reply With Quote
  #7  
Old 08-12-2017, 10:23 PM
jr_tech's Avatar
jr_tech jr_tech is offline
VideoKarma Member
 
Join Date: Sep 2009
Posts: 3,478
Make that 7

But then, I seem to have more trouble than most with horizontal problems on early RCAs.

jr
Reply With Quote
  #8  
Old 08-13-2017, 03:53 PM
benman94's Avatar
benman94 benman94 is offline
Super Moderator
 
Join Date: Jun 2011
Location: Detroit, MI
Posts: 695
Very pleased to report that the 12LP4 in your set tests like a brand new tube. I think this was a very low hours set...
Reply With Quote
  #9  
Old 08-13-2017, 04:24 PM
Crist Rigott Crist Rigott is offline
VideoKarma Member
 
Join Date: Oct 2015
Location: Waxahachie, TX
Posts: 834
Quote:
Originally Posted by benman94 View Post
Very pleased to report that the 12LP4 in your set tests like a brand new tube. I think this was a very low hours set...
I'm all smiles! Looks like it'll be a good restoration. Now I gotta get rid of the smell!

Looking forward to tackling the H Lin. problem too.

Thank you Ben.
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 05:28 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.