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 Post subject: CBS Test Picture Tube
PostPosted: Mar Fri 24, 2017 3:51 am 
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Joined: Nov Sun 09, 2014 6:42 am
Posts: 217
Location: Rockford, IL
Can someone explain the use for this? It's on CL. I am not interested in owning one, but seems pretty neat.


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 Post subject: Re: CBS Test Picture Tube
PostPosted: Mar Fri 24, 2017 4:06 am 
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Joined: May Thu 14, 2015 4:15 pm
Posts: 505
Location: Dallas, TX
Looks like a 8YP4. I just picked up a Sylvania made one this weekend at an auction. Paid $ 10. (No other bidders). Mine came with a socket adapter but not the HV lead.
You can substitute the test CRT for the one in the TV set. It is made to work over a broad range of voltages and such, self focused. It either tells you the regular CRT is faulty or just makes it possible to trouble shoot the chassis without having to deal with the bigger regular CRT.

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 Post subject: Re: CBS Test Picture Tube
PostPosted: Mar Fri 24, 2017 11:22 am 
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Joined: Jan Sat 16, 2016 10:03 pm
Posts: 316
I have a few of these with different deflections. They are service tubes that are light-weight so the chassis can be turned on its side for servicing without risking the heaver and larger crt and giving you access to components under the larger crt. I have one that is outfitted in a suitcase type contraption with its own yoke. I have been told by the pros on here that service crts were never intended to adjust and detail the picture. They were used to see if a picture was being projected.


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 Post subject: Re: CBS Test Picture Tube
PostPosted: Mar Fri 24, 2017 3:13 pm 
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Joined: Jun Thu 15, 2006 1:21 am
Posts: 4680
Location: NE Ohio
Picture this 120+ pound Drexel TV console. The CRT is mounted to the cabinet, not the chassis. The chassis is headed to the shop for repairs. You surely don't want that CRT rolling around in the back of the truck.

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Bruce


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 Post subject: Re: CBS Test Picture Tube
PostPosted: Mar Fri 24, 2017 7:20 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5148
Location: Woodinville, WA USA
http://antiqueradio.org/8XP4PictureTube.htm

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Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html


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 Post subject: Re: CBS Test Picture Tube
PostPosted: Mar Sat 25, 2017 5:49 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 11841
Location: San Jose, CA USA
I sold one of those (maybe that one???) a few years ago.

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