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JAC
Joined: 24 Jul 2005
Posts: 3469
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 Posted: Tue Apr 08, 2008 5:15 pm Post subject: |
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GN4 red filter coated. The red filter coating improves the contrast, making the tube easier to read. Not the largest tube, but a really beautiful tube. The red filter coating is a very good quality and covers the whole tube, unlike some of the cheaper copies. ( for example Tesla brand yuk!)
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Tue Apr 08, 2008 5:21 pm Post subject: |
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GNP7. This tube is part of the reason why I "discovered" nixies. I had this for many years in one of my electrical component racks. One day while frustrated with a circuit problem at work I decided to clear my mind and to get this tube going. To my amazement I found a bunch of info on the web, lots of clocks and other crazy things. Anyway, once I fired this baby up I was hooked. Ok, its not the largest, its not rare, its just the reason why I am sat here typing this.
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Tue Apr 08, 2008 7:45 pm Post subject: |
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| wepwawet wrote: | | the hp chip 's backside shows the hp logo and three of them read: 5082-7101 |
5082-7101 is indeed the part number - here's the data sheet in PDF format:
http://home.comcast.net/~cwebster68/5082-71xx.pdf
- CMW |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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| Posted: Tue Apr 08, 2008 7:56 pm Post subject: |
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Speaking of VFDs, at one time I had a couple hundred of these, but I sold most of them off the last time I moved. VFDs are like an inverted cathode ray tube, with the phosphor in back and the filament in front.
- CMW |
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Wed Apr 09, 2008 5:44 am Post subject: |
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Yes, they are nice tubes thanks. Currently I am in hoard mode when I find stock of tubes I want to buy. I'll post more tubes later. A bit busy at work right now.
I like VFD's as well, I have a stack of them. I tend to get the ones with driver chips already on. While its not difficult to homebrew, it is a painintheass.
The CD47's are very nice. I'd like one as well. I have heard, but not seen, prices ranging up to $800 each, but I suspect they would sell for more than that now. This is supported with a recent sale of a used CD46.
Here is the used one that sold...
Well over $800 for a used tube!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130210246484
Lucky Strike indeed!
I have to say that is an insane price. I know its a nice tube, but for that money I can buy a hundred brand new 1" digit height tubes!
Last edited by JAC on Wed Apr 09, 2008 5:47 am; edited 1 time in total |
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wepwawet
Joined: 18 Mar 2004
Posts: 3019
Location: Seligenstadt - Germany
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| Posted: Wed Apr 09, 2008 5:47 am Post subject: |
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Thanks much for that!
Still I am wondering why those others have then a 1990-... part number.
But maybe I set up an ebay search now for this number and somewhen get one NOS as mine are all desoldered:-) |
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chip68
Joined: 19 Oct 2004
Posts: 1024
Location: Central Pennsylvania
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donutty
Joined: 16 Feb 2008
Posts: 1122
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| Posted: Wed Apr 09, 2008 12:11 pm Post subject: 1990-0477 if anybody wants them |
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I have 2x HP 1990-1477 dated 8752 if anybody wants them. Pictured with the customary Pentium gold cap (just a boring one.. not ES) and JAC's favourite 486 DX25 (albeit SX308 variant)
Offers? |
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Wed Apr 09, 2008 1:02 pm Post subject: |
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Yes, I am interested  |
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donutty
Joined: 16 Feb 2008
Posts: 1122
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JAC
Joined: 24 Jul 2005
Posts: 3469
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| Posted: Fri May 30, 2008 4:03 pm Post subject: |
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ah yes, nice displays, but they are not ceramic  I promise to get the ones you sent me fired up this weekend.
I have just been a bit busy recently with other stuff. Like  and  |
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hugo929
Joined: 27 Oct 2006
Posts: 6163
Location: China
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doccybrown
Joined: 03 Oct 2005
Posts: 1736
Location: Germany
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| Posted: Wed Jun 24, 2009 4:21 pm Post subject: |
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A lot of Nixies - am I the
only one who loves soviet IN-18`s?
_________________
Ordem e Progresso |
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CPUShack
Joined: 16 Jun 2003
Posts: 34259
Location: State of Jefferson, USA
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