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
  #31  
Old 05-31-2017, 01:33 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 14,762
BTW if the wave appears as a horizontal bar that slowly rolls vertically, then it is likely the Power supply lytics.
__________________
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
  #32  
Old 05-31-2017, 01:53 PM
Zenith26kc20's Avatar
Zenith26kc20 Zenith26kc20 is offline
VideoKarma Member
 
Join Date: Apr 2009
Location: New Orleans
Posts: 824
Usually power supply electrolytics start off waving then as they warm up thermally they work. If the power supply electrolytics are failing after they have been on a while they start to run warm to the touch. Be careful, my RCA CTC-9 almost had it's power transformer burned up by a leaky electrolytic.
I would try subbing a horizontal oscillator tube as heater to cathode leakage can also produce the symptoms you are describing.
What signal sources are you using?
Reply With Quote
  #33  
Old 05-31-2017, 06:30 PM
ThePlague ThePlague is offline
VideoKarma Member
 
Join Date: Apr 2017
Location: Colorado
Posts: 60
Quote:
Originally Posted by Zenith26kc20 View Post
Usually power supply electrolytics start off waving then as they warm up thermally they work. If the power supply electrolytics are failing after they have been on a while they start to run warm to the touch. Be careful, my RCA CTC-9 almost had it's power transformer burned up by a leaky electrolytic.
I would try subbing a horizontal oscillator tube as heater to cathode leakage can also produce the symptoms you are describing.
What signal sources are you using?
I'm using a kindle fire into a hdmi to av converter that then runs into a rf demodulator. This combination is able to stave off the issue the longest. As for the waves.. imagine a side ways V that goes through and distorts the image. It does not roll. A combination of the tuner fine tuning, contrast control, and a little horizontal lock and can usually bring it back for another hour and then not much seems to help it.
Reply With Quote
  #34  
Old 05-31-2017, 06:35 PM
ThePlague ThePlague is offline
VideoKarma Member
 
Join Date: Apr 2017
Location: Colorado
Posts: 60
Here are a few examples of some of the issues that will happen.




Notice that grey ish line in the middle. Under normal conditions that line is straight and centered.
Reply With Quote
  #35  
Old 05-31-2017, 07:32 PM
irext's Avatar
irext irext is offline
VideoKarma Member
 
Join Date: Dec 2016
Posts: 69
I would recap it and measure resistors whilst performing the recap. You've already found crook caps in the vertical and hor circuits so it's highly likely that there are others just as bad elsewhere in the set. Once that's done you can address any remaining faults.
Reply With Quote
Audiokarma
  #36  
Old 06-01-2017, 12:41 AM
Bill Cahill's Avatar
Bill Cahill Bill Cahill is offline
Super Moderator
 
Join Date: Mar 2005
Location: St. Petersburg, Fl.
Posts: 1,298
Post

That is correct. Some of those mica caps also look suspect. Looks like one paper cap had exploded from being shorted.
I agree with them that say replace all paper caps, and, electrolytics so you will have a trust-worthy set.
I also see why the vertical has fold over, more bad caps. The audio caps are always bad. And, I've actually found damaged controls from shorted caps.
Bill Cahill
__________________
"Tubes are those little glass things that light up orange unless there is a short.. Then they light up all pretty colors..."
Please join my forum.
http://www.tuberadioforum.com/
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 01:48 AM.



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