Videokarma.org

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

Notices

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #31  
Old 02-13-2015, 11:19 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 542
Without the 115 volt B+ line connected , your sync pulses can't lock-in
the vertical or horizontal oscillators, nor would the sound work well.
Ed
Attached Images
File Type: jpg MVC-728S.JPG (37.9 KB, 13 views)
File Type: jpg MVC-729S.JPG (36.9 KB, 8 views)
File Type: jpg MVC-731S.JPG (39.0 KB, 4 views)
File Type: jpg MVC-736S.JPG (36.7 KB, 4 views)
File Type: jpg MVC-737S.JPG (35.9 KB, 8 views)
Reply With Quote
  #32  
Old 02-13-2015, 11:37 PM
EdKozk2 EdKozk2 is offline
Tinker
 
Join Date: Mar 2014
Location: Elkhorn, WI
Posts: 542
More of the Motorola 19K2
Attached Images
File Type: jpg MVC-730S.JPG (35.8 KB, 9 views)
File Type: jpg MVC-735S.JPG (37.0 KB, 6 views)
File Type: jpg MVC-740S.JPG (36.9 KB, 6 views)
File Type: jpg MVC-734S.JPG (38.9 KB, 7 views)
Reply With Quote
  #33  
Old 03-02-2015, 10:40 AM
radio nut's Avatar
radio nut radio nut is offline
Born in the wrong decade
 
Join Date: Dec 2007
Location: Lima, Ohio
Posts: 836
ok, I put on tube shields, put the b plus wire back on, replaced a cap that I was told to test and here is what I have. The vertical is locking, the horizontal is jittery, and the image on the screen is a negative image...
At least it appears that way to me and still is washed out like the signal too strong or too weak.
Reply With Quote
  #34  
Old 03-02-2015, 01:12 PM
radio nut's Avatar
radio nut radio nut is offline
Born in the wrong decade
 
Join Date: Dec 2007
Location: Lima, Ohio
Posts: 836
It was mentioned to check the cap in b plus line to pin 5 of the video amp, which I replaced again to be safe. There is a ceramic cap in parallel with a coil in that line that might also be an issue so i did grab a replacement for it and will try it tonight...hopefully!
Reply With Quote
  #35  
Old 04-18-2015, 04:10 PM
radio nut's Avatar
radio nut radio nut is offline
Born in the wrong decade
 
Join Date: Dec 2007
Location: Lima, Ohio
Posts: 836
i put in a new cap.....it is in parallel with a 4.5 min coil coming off of the video amp.
the picture is better,but retested the crt and it is shorted............and i do not have a replacement. so this project is on hold for now.
Reply With Quote
Audiokarma
  #36  
Old 04-18-2015, 04:48 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 15,445
Is it a heater-cathode short? If so just get an isolation transformer for the heater (some 'brighteners' were not brighteners, but rather isolation transformers) or add a separate heater transformer for the CRT.
__________________
Tom C.

Zenith: The quality stays in EVEN after the name falls off!
What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
Reply With Quote
Reply



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 02:53 PM.



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