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
  #16  
Old 07-05-2018, 08:42 AM
electronjohn's Avatar
electronjohn electronjohn is offline
I like....big sparks!!
 
Join Date: Jan 2006
Location: minnesota
Posts: 507
Restoration? More like resurrection You do love those challenges, don't you? Stupid thought: After you get it up & running maybe a few days with just "snow" for a raster would minimize the horiz line? Dunno.
__________________

Ham shack...AM side: Knight-Kit T-60, RME-45
Vintage SSB side: National 200
Modern SSB: Kenwood TS-180S
MFJ tuner, 130' dipole
Reply With Quote
  #17  
Old 07-05-2018, 12:30 PM
Notimetolooz's Avatar
Notimetolooz Notimetolooz is offline
VideoKarma Member
 
Join Date: Mar 2014
Location: Dallas, TX
Posts: 161
Tony F
When I was working on a jukebox last year, I used Scrubbing Bubbles out of desperation when nothing else would remove some crud. The crud seemed to be something like tobacco residue+dust+mold. I tried window cleaner, alcohol, naptha, even Simple Green if I recall and nothing worked. It was a painted surface. The regular Scrubbing Bubbles worked like a miracle.
Reply With Quote
  #18  
Old 07-05-2018, 01:27 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: 4,720
Quote:
Originally Posted by electronjohn View Post
Restoration? More like resurrection You do love those challenges, don't you? Stupid thought: After you get it up & running maybe a few days with just "snow" for a raster would minimize the horiz line? Dunno.
Good luck, but I'm guessing you will never get rid of the burn line by running a regular raster. Remember that the full raster is only 1/525 as intense as the collapsed line. You would have to run a bright raster with a dark line in the burned area, for 525 times as long as the collapsed raster ran, to even out the burn completely.
__________________
www.bretl.com
Old TV literature, New York World's Fair, and other miscellany
Reply With Quote
  #19  
Old 07-05-2018, 01:51 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,366
I had a set with a visible line on the screen, it was quite noticeable with the tube lit, might be less so with an actual picture instead of a blank raster.
Reply With Quote
  #20  
Old 07-05-2018, 03:11 PM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,895
At least the phosphor did not burn completely off...It just aged it some like how the round projection tubes from the early post-WWII projection sets that saw use have a distinct rectangle aged into them by the raster.

If Bob's lucky the difference in phosphor brightness/color could be minor enough not to notice.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
Audiokarma
  #21  
Old 07-06-2018, 09:38 AM
bandersen's Avatar
bandersen bandersen is offline
Restoring Admiral T2301
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 7,334
Hopefully we'll know sooner than later. I intend to do a basic power supply recap and try to power it up and get a raster.

Last night I took a look inside and it's in pretty good shape.




It's very dusty, but cleans up easily with compressed air and a damp rag.




Here's the other end with the power supply, tuner and IF.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #22  
Old 07-06-2018, 09:55 AM
bandersen's Avatar
bandersen bandersen is offline
Restoring Admiral T2301
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 7,334
A few initial findings:

The chassis was only held in by a couple screws on the tuner. Was someone working on it ? I already know the CRT was been replaced.


* A 6FD7 was found in the 6DR7 socket and it was very loose. That's the vertical oscillator and output tube. The 6FD7 is a little beefier and should be a good sub.

I wonder if it got knocked loose and that caused the vertical to collapse ?


* One of the caps used in the B+ voltage doubler looks like it leaked and dried out. It will definitely get replaced ASAP. The fusistor looks corroded but haven't checked for continuity yet. Was glad to see one in place and not a hunk of wire shorting it out. Hoping that is there was a problem it did it's job and protected the set.


* Finally, the big, 4-section electrolytic can is loose but appears to be the original. There should be a clamp holding it down. Perhaps more evidence of a repair attempt.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #23  
Old 07-07-2018, 02:43 AM
bandersen's Avatar
bandersen bandersen is offline
Restoring Admiral T2301
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 7,334
I spoke too soon - the fusistor has been compromised


At least the cleaning is progressing nicely.


I found that Spray 9 does an excellent job. It is a harsh cleaner though so use with care.


I think an auto finish detailing product like something from Meguires will even out the color.


Now back to the chassis...
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 07-07-2018 at 03:00 AM.
Reply With Quote
  #24  
Old 07-07-2018, 07:16 AM
AlanInSitges's Avatar
AlanInSitges AlanInSitges is offline
VideoKarma Member
 
Join Date: Nov 2017
Location: Sitges, Catalonia, Spain
Posts: 41
I'll bet you can remove and replace the PCB with all the wire-wraps from memory by now.
Reply With Quote
  #25  
Old 07-07-2018, 11:53 AM
Electronic M's Avatar
Electronic M Electronic M is offline
M is for Memory
 
Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,895
Quote:
Originally Posted by AlanInSitges View Post
I'll bet you can remove and replace the PCB with all the wire-wraps from memory by now.
Some of the 17" predictas actually have enough holes under the main board to get a soldering iron in without pulling the board...I did that on mine.
__________________
Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
Reply With Quote
Audiokarma
  #26  
Old 07-12-2018, 06:52 PM
Bill R Bill R is offline
VideoKarma Member
 
Join Date: Oct 2004
Location: Jackson, TN
Posts: 861
Good luck. Mine is completely covered in black soot from the house fire. It looks nothing like the crud you are cleaning off that set.
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 12:24 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
ęCopyright 2012 VideoKarma.org, All rights reserved.