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.
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #10  
Old 08-30-2015, 06:35 PM
Retro-guy Retro-guy is offline
VideoKarma Member
 
Join Date: Feb 2015
Posts: 26
Okay got some good news !

The TV powered up no problem got high voltage, full deflection some sound and when i clunk thru the channels the picture responds good, but still only raster, which is probably the tuner/if strip problem ...


Checked and flyback and is cool, not even worm to touch also the HO tube is worm but is not getting hot, like on some of my other sets, then I measured the cathode current of HO and its between 100 and 120 mA, which is maybe a bit to low, what you guys think ??

But there is a problem, this set has a small power transformer and is original, cause of the sticker on it and is used to supply 6.3V to picture tube heater and 16V to some other tube filament on chasy, but IM getting about 7.8V for the CRT filament and I checked there is no visible modifications, but then I realized that the input of the power transformer is 220V which says on sticker and power going into tv is 240V so can that cause the it to be higher for 1,5V ?? ,and it comes straight from the fuse to the transformer.

Its bothering me because when I turn TV on the picture tube filament flashes like a light bulb for a few seconds and then dims down and works OK.I checked the current on the filament and its 300 mA for what is rated at 6.3V .Is there anything I can add to ease up the worming of the filament so its not instantly on, like slow worming of the filament cause I dont want to burn it out ??


I ONLY REPLACED THE CAPACITORS, ALL THE ELECTROLYTIC + FILTER CAPS ARE ORIGINAL AND THE SELENIUM RECTIFIER IS ALSO IN THERE, now It gets brighter if I clunk thru the channels and turn the pots,which are dirty and jumpy.
Attached Images
File Type: jpg IMG2255.jpg (67.5 KB, 18 views)
File Type: jpg IMG2260.jpg (33.0 KB, 16 views)
File Type: jpg IMG2261.jpg (35.9 KB, 6 views)
File Type: jpg IMG2262.jpg (39.4 KB, 15 views)
File Type: jpg IMG2263.jpg (53.3 KB, 25 views)
Reply With Quote
Audiokarma
 


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 10:38 PM.



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