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
  #1  
Old 02-09-2011, 11:07 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Admiral T102 scored

I've wanted one of these little two-tone portables for a while and one finally showed up just a few miles away. The seller has a nice collection of vintage furniture, paintings and nicknacks. He's moving to Maui so it all has to go.

There are a few chips and some worn areas, but not bad for a 55 year old set I think. All the knobs are there too.

I'm a little surprised it draws 135 watts. Seems like a lot for a little 10" set.

__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #2  
Old 02-10-2011, 01:31 PM
mbear2k mbear2k is offline
VideoKarma Member
 
Join Date: Feb 2010
Posts: 129
Very nice. One of those are on my list of 'want to haves'.
Reply With Quote
  #3  
Old 02-10-2011, 10:57 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
I recently picked up a pile of Riders and Sams, but am missing this model
Does anyone have a scan of the Sams or Riders for this model ?

Thanks!
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #4  
Old 02-11-2011, 11:40 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
I spent a few hours going over this set tonight. The front came off easily enough, but the back was stuck.


The knobs were especially stubborn. I'll let them soak a while to clean off the gunk.


I ended up pulling the whole chassis. It's a little dirty, but looks OK.


National Video Corp picture tube. I hope it's good.


Yes it is


The speaker has a little patch. Could that be asbestos around that tube ?


The bottom is nice and clean.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 02-12-2011 at 12:33 AM.
Reply With Quote
  #5  
Old 02-11-2011, 11:56 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Curiosity got the better of me and I slowly powered it up on a variac and isolation transformer over the course of an hour or so.
I kept my fingers crossed that the seleniums and electrolytics had some life left. None of the cans got hot.

Eventually, I was treated to a raster


I flipped the clunker around until I hit 6 where we still have a low power NTSC signal.
The horizontal, brightness and contrast are all very touch, but I do get video and sound
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 02-12-2011 at 12:34 AM.
Reply With Quote
Audiokarma
  #6  
Old 02-11-2011, 11:59 PM
leadlike's Avatar
leadlike leadlike is offline
VideoKarma Member
 
Join Date: Apr 2008
Location: Lancaster, Pa
Posts: 956
You bet that's asbestos! I've wanted one of these portables for awhile, just of the same generic 8pt, hotpoint variety. Everyone I've found has been too overpriced. It's cool you get that copper plated chassis with that package, too.
Reply With Quote
  #7  
Old 02-12-2011, 12:28 AM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
I paid $65 for it. Dunno if that's a good price, but it was so close to home I couldn't pass on it.

I tweaked it a bit more and hooked up a converter box. Here's some Untouchables action.

Yes, I know - the seleniums and caps are likely to fail any time. I'll do a proper resto. soon.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 02-12-2011 at 05:40 PM.
Reply With Quote
  #8  
Old 02-12-2011, 05:42 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Quote:
Originally Posted by leadlike View Post
You bet that's asbestos! I've wanted one of these portables for awhile, just of the same generic 8pt, hotpoint variety. Everyone I've found has been too overpriced. It's cool you get that copper plated chassis with that package, too.
I wonder why only one tube has asbestos It's on the tuner and the other two tubes have metal shields.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #9  
Old 02-12-2011, 07:22 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
Quote:
Originally Posted by bandersen View Post
I wonder why only one tube has asbestos It's on the tuner and the other two tubes have metal shields.
Probably because it's right next to the metal cabinet and they didn't want a hot spot on the side of it.
Reply With Quote
  #10  
Old 02-14-2011, 01:32 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Here's the turquoise version for sale in Kingston, WA. http://cgi.ebay.com/VERY-NICE-1957-1...-/260737501535



I wonder if that antenna is stock ? Perhaps I'm missing mine ?
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
Audiokarma
  #11  
Old 02-14-2011, 02:21 PM
Eric H's Avatar
Eric H Eric H is offline
Administrator
 
Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
I have a couple of these, one Turquoise and White and one Two Tone Green.

The Turquoise one is the first thing I ever bought on eBay around 1998 and it was a mess, got it working and repainted it but it's still not all back together.

the Green one just needed a Damper tube and it worked, it still came on a couple months ago when I tried it last. I bought it pig in a poke from some woman who contacted me through my site I think. It's in good shape with just a little peeling paint.
Reply With Quote
  #12  
Old 02-14-2011, 02:24 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Quote:
Originally Posted by Eric H View Post
I have a couple of these, one Turquoise and White and one Two Tone Green.

The Turquoise one is the first thing I ever bought on eBay around 1998 and it was a mess, got it working and repainted it but it's still not all back together.

the Green one just needed a Damper tube and it worked, it still came on a couple months ago when I tried it last. I bought it pig in a poke from some woman who contacted me through my site I think. It's in good shape with just a little peeling paint.
Cool Do they have an antenna on the back ?
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
  #13  
Old 02-14-2011, 02:29 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
I popped the CRT out and found where all the caps were hiding
It's much easier to work on now I used a sharpie to mark where the ion trap magnet and other bits were positioned. I hope that'll make it easier to put back together properly.
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery

Last edited by bandersen; 02-14-2011 at 11:57 PM.
Reply With Quote
  #14  
Old 02-14-2011, 11:21 PM
Big Dave's Avatar
Big Dave Big Dave is offline
Dead from the neck up
 
Join Date: Jun 2002
Location: Warren, OH
Posts: 474
You definitely need to do the hot chassis fix. these were notorious for the cabinets being hot despite all insulators being in place.
__________________
The world's worst TV restoration site on the entire intranoot and damn proud of it.
http://evilfurnaceman.tripod.com/tvsite
Reply With Quote
  #15  
Old 02-15-2011, 01:19 PM
bandersen's Avatar
bandersen bandersen is offline
RCA 741PCS
 
Join Date: Mar 2009
Location: Chicago, IL
Posts: 8,085
Quote:
Originally Posted by Big Dave View Post
You definitely need to do the hot chassis fix. these were notorious for the cabinets being hot despite all insulators being in place.
What's the fix ? better insulators ?

Speaker of hot chassis, there's a big 54 ohm 20W resistor running down one side to drop the filament voltage.

Here's the series wired tube lineup:

3.15 - 3BC5
4.70 - 5J6
3.15 - 3CB6
3.15 - 3CB6
6.30 - 6BA8A
4.70 - 5U8
3.15 - 3DT6
12.6 - 12CU5
6.30 - 6CM7
6.30 - 6CG7
12.6 - 12DQ6
12.6 - 12AX4GTA
6.30 - 10ABP4
----
85 @ 600mA

I plugged that into this website Reece tipped me off to and got this.

note: I used 120 for the supply voltage. If I use 117, I get 53 ohms @ 19.2 W.

* Dropper resistor = 60 ohms @ 21.6 W

* Dropper resistor with diode = 1 ohms @ 0.3 W

* Dropper capacitor = 22 uF + 17 ohms @ 6W

I like the idea of shaving off most of that wasted 20W. Has anyone tried the diode or capacitor method in a series string TV set ?
__________________
Here are my Vintage Radio & TV YouTube Channel and Photo Gallery
Reply With Quote
Audiokarma
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 10:15 AM.



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