Videokarma.org

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

Notices

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 06-06-2022, 02:29 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 7,748
Quote:
Originally Posted by Yamamaya42 View Post
Yes, I can see how it can, as its fed directly off the cathode of the Vert output via a cap resistor network, (50uf/5.6k) , but I MAY have screwed the pooch a bit here, , I did not replace c4 with an exact 50uf 150v cap like as listed, but with a 56uf 200v.
Will that 6uf throw things off that much?
My guess is it's not critical because it's not in the feedback loop for the vertical circuit.
Edit: besides, electrolytic tolerance is so wide it would never be designed into a spot that could have a large influence. It generally just needs to be big enough.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
  #2  
Old 06-06-2022, 02:42 PM
Yamamaya42's Avatar
Yamamaya42 Yamamaya42 is offline
VideoKarma Member
 
Join Date: Nov 2018
Location: Round Rock TX
Posts: 3,177
Quote:
Originally Posted by old_tv_nut View Post
My guess is it's not critical because it's not in the feedback loop for the vertical circuit.
Edit: besides, electrolytic tolerance is so wide it would never be designed into a spot that could have a large influence. It generally just needs to be big enough.
but it does go down (pt 51) to pin 2 on the convergence assy plug, which goes directly to r27 R-G vert lines top, I have always wondered if that 56uf cap was a mistake.
__________________
=^-^=
Yasashii yoru ni hitori utau uta. Asu wa kimi to utaou. Yume no tsubasa ni notte.
いとおしい人のために
Reply With Quote
  #3  
Old 06-06-2022, 04:41 PM
old_tv_nut's Avatar
old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
Posts: 7,748
Quote:
Originally Posted by Yamamaya42 View Post
but it does go down (pt 51) to pin 2 on the convergence assy plug, which goes directly to r27 R-G vert lines top, I have always wondered if that 56uf cap was a mistake.
Again, I think its only job is to be big enough. If you have a spare 50 microfarad of the right voltage rating, you could tack it across C4 to see if even doubling the value does anything.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
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 07:36 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2026, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.