[NJARC] Museum Needs CRT

[Al Klase]

Hi Dave,

Please dig out an 3RP1 if you can.

I took a shot at rejuvenating the one here without much success.



I ran 9 VDC on the heater for an hour, pulling 20 mA from a 140 VDC 
supply through a 4.7K resistor.  Then turned off the DC, and reduced the 
heater to 6 VDC for half an hour.  Display doesn't seem much brighter, 
and I felt like I never detected an increase in emission. Do I need to 
draw more current?

Do any of you have a handle on this procedure?

Thanks,
Al

On 3/24/2017 2:39 PM, David Sica wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
>
>
> I'm pretty sure I have a couple of 3RP1s lying around.   As a 
> "don't-force-it-get-a-bigger-hammer" substitute for the Pilot TV CRT, 
> I pick them up whenever I run across one inexpensively.
>
> The trick, as usual, will be to actually locate it in the endless 
> piles of radio merriment in the basement.
>
> Have you considered rejuvenating the existing tube or wiring in a 
> brightener?  There's a decent chance that one or the other of those 
> tricks will help, possibly for quite a while.
>
> I expect to be at InfoAge on Sunday afternoon; I'll let you know if I 
> find one and if I do, I'll leave it at the museum for you.
>
> -- Dave Sica
>
> On Fri, Mar 24, 2017 at 12:16 PM, Al Klase <ark at ar88.net 
> <mailto:ark at ar88.net>> wrote:
>
>     Just remember
>     Reply = Poster
>     Reply All = Everyone
>
>     _________________________________________________________
>     Folks,
>
>     Last week the RTM received a generous donation of Marantz stereo
>     equipment, including a 10B tuner.  This is a timely event as we're
>     getting ready to rearrange the displays to highlight recorded music.
>
>     The 10B cost $650 in 1965 which is about 5 Grand in today's cash.
>     It's a thing of beauty.  Looks like military electronics on the
>     inside.  After clearing away five decades of grime and a little
>     TLC it works quite well.  See:
>     http://www.ar88.net/audio/10B%20Scope.m4v
>     <http://www.ar88.net/audio/10B%20Scope.m4v>
>
>     Of course the built-in oscilloscope is the best part, but I had to
>     shoot that video in a darkened room.  We need a new CRT.
>
>     It's a 3" CRT known variously as DG-32, 3RP1, or CV2431. It's
>     shorter than the common 3BP1, and operates at lower voltage.  I
>     can buy one for about $65, but thought I'd ask the group first.
>
>     The donation also included a Model 7 preamp, an 8B power amp, two
>     large speakers, and an Ampex home-sized tape deck. Cool stuff!
>
>     Check your junk boxes,
>     Al
>
>     -- 
>     Al Klase – N3FRQ
>     Jersey City, NJ
>     http://www.skywaves.ar88.net/
>
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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