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 03-09-2014, 02:07 PM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
Zenith Integrators

From what I can see, the integrators (87-5 is the one I need) are made of five parts. Two resistors and three capacitors. I have the values and they appear to be made up of ceramic disc capacitors. Has anyone made the vertical one? The resistive portion should be 94K ohms (2) 47K resistors in series). Mine measures 225K ohms and I cannot achieve full sweep. I have about two inches of black on the bottom of my 25MC33 Zenith.
Reply With Quote
  #2  
Old 03-09-2014, 03:15 PM
zeno's Avatar
zeno zeno is offline
VideoKarma Member
 
Join Date: Mar 2013
Location: New Hampshire
Posts: 4,672
Quote:
Originally Posted by Zenith26kc20 View Post
From what I can see, the integrators (87-5 is the one I need) are made of five parts. Two resistors and three capacitors. I have the values and they appear to be made up of ceramic disc capacitors. Has anyone made the vertical one? The resistive portion should be 94K ohms (2) 47K resistors in series). Mine measures 225K ohms and I cannot achieve full sweep. I have about two inches of black on the bottom of my 25MC33 Zenith.
Never made one up, twas a stocked item. One end of each cap
goes to ground (center leg) other ends go to each resistor ( end legs)
& one to the resistor jcn.

73 Zeno
Reply With Quote
  #3  
Old 03-09-2014, 05:31 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
I made one when I was messing with my Flashmatic trying to get the vertical linearity right, if I remember right the integrators made very little difference in the picture, even if you left them out. I never did get it working exactly right and wound up fudging the Cap values elsewhere to get an acceptable picture.
Reply With Quote
  #4  
Old 03-09-2014, 09:16 PM
reeferman's Avatar
reeferman reeferman is offline
VideoKarma Member
 
Join Date: Jun 2004
Location: St. Louis
Posts: 583
I worked on a lot of Zeniths and what you describe is the classic failure symptom.
I would automatically change them, bad or not.
Reply With Quote
  #5  
Old 03-10-2014, 08:19 AM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
biggest problem is I'm five days away from getting back to the set!!!!
Patience is a virtue I guess!
Reply With Quote
Audiokarma
  #6  
Old 03-10-2014, 08:46 AM
Kamakiri's Avatar
Kamakiri Kamakiri is offline
Administrator
 
Join Date: Jun 2002
Location: Buffalo, New York
Posts: 5,109
Here's a thread that I had on my '61 Zenith that used them, we discussed the integrators a bit:

http://www.videokarma.org/showthread.php?t=258080
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
Reply With Quote
  #7  
Old 03-10-2014, 10:27 AM
dieseljeep dieseljeep is offline
VideoKarma Member
 
Join Date: Jul 2010
Posts: 7,562
Quote:
Originally Posted by reeferman View Post
I worked on a lot of Zeniths and what you describe is the classic failure symptom.
I would automatically change them, bad or not.
The replacements were a lot better quality, than the originals.
I don't know why Zenith made their own caps! It seems like an inexpensive item to purchase, instead of having to maintain plant space. I know that the disc capacitors were usually duals, but they didn't even look good. Poor value stamping and they always looked like they were cracked.
Reply With Quote
  #8  
Old 03-10-2014, 01:03 PM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
got the parts in my pocket. Two 1600 volt caps and one 630 volt. Got the resistors too! Going to put them in the truck and WAIT......
Bah!
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 06:58 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.