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 Post subject: 7043 vacume digital display tubes
PostPosted: Mar Wed 07, 2018 7:33 pm 
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Joined: Feb Thu 08, 2007 2:32 pm
Posts: 11569
Location: 06457
Going through small boxes, don't even know where these tubes came from, just stuff. Manufacture date 1948 RCA,# 7043 numerical display tubes. not miniature tubes. Any use or toss??


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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Wed 07, 2018 7:40 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 854
Location: Wayside, NJ Monmouth
Can you post a phot or two ?.


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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Wed 07, 2018 8:14 pm 
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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Wed 07, 2018 8:28 pm 
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Joined: Nov Sun 04, 2007 6:01 am
Posts: 2886
Location: Redding, CA
They are vacuum phototubes, not numerical display tubes. They may be of use to folks interested in light and physics.

Norman

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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Thu 08, 2018 12:00 am 
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Joined: Jun Fri 19, 2009 6:34 pm
Posts: 7697
Location: Long Island
Do a google on them. They are cylindrical photocells which vary their resistance when illuminated. They do not light up themselves. Very interesting, unusual photocells that were used in the tone generator systems of Kimball organs. The organs used spinning disks with optical tracks on them, similar to sound tracks on movie film, to produce the various "voices." Multiple exciter lamps were located on the other side of the disks and lenses. When you pressed a key on the keyboard, it would turn on one or more lamps which would shine through the moving tracks, modulating the light. The photocells would convert the modulated light to an audio voltage.

Probably not of much use for anything else, but they could be of great interest to somebody who is restoring or maintaining an old Kimball. If you don't want them, I'd suggest advertising them in connection with Kimball organs and see where that leads.

http://lampes-et-tubes.info/pc/pc104.php

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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Thu 08, 2018 12:10 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 2700
Location: The Old Dominion VA 23518
They were also used in some 1960s-vintage De-icing trucks we had at one Naval air station. I had to buy a pair from.....sigh.....eBay to keep the trucks up. They sensed either flow or liquid level IIRC, and while we had a work-around, for the sake of 18 dollars (this was ~2005/2006), I popped for them to get the trucks full mission capable....only to find two burnt out bulbs as well. :cry:

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"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Thu 08, 2018 7:15 pm 
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Joined: Jan Fri 17, 2014 7:26 am
Posts: 1435
Location: In the village, 19115
I have some of those. I collect them because they are unusual.

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I like things that light up, tubes, bulbs, LEDs, whatever, and things that make noise.


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 Post subject: Re: 7043 vacume digital display tubes
PostPosted: Mar Sun 11, 2018 9:27 am 
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Joined: Feb Mon 26, 2018 6:53 am
Posts: 11
That's definitely a keeper, even if just for the rad factor. If you don't want them, hit me up if you haven't passed them off already.


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