For the 5245L, the Nixies pull straight out of their sockets. They pull out
perpendicular to the faceplate.
John WA4WDL
--------------------------------------------------
From: "paul swed" <[email protected]>
Sent: Saturday, January 09, 2010 12:29 PM
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Subject: Re: [time-nuts] HP 5245L counter circa 1967 humor
Very very interesting read on hollow leads. Like you I also had spares in
the conductive foam and learned the same thing. Very bad indeed.
I do need to look at several of the decoders to nixies they are acting
strange and would easily guess that the neon bulb logic has some flaky
bulbs. I started opening that section up and stopped. Its going to be a
fair
job. It will be really curious how did they get all those little photo
resistors around the neon bulbs? Though with humor a 74ls90 cntr 7475
latch
and 74141decoder would eliminate all of that, but thats not how the unit
works. hate to hack it that way.
Anyone know if the burroughs nixies just pull out of the socket? At least
I
think its a socket.
I tried and they did not let go. I want to separately test the nixie I
think
its actually OK.
Thanks
PS I don't see carcasses anymore at flea markets. More importantly no test
equipment anymore. The ebay effect.
On Sat, Jan 9, 2010 at 10:46 AM, David Forbes <[email protected]>
wrote:
At 9:59 AM -0500 1/9/10, Gary Chatters wrote:
The 5261A Video Amplifier plug in will get the sensitivity down to 1 mv.
The 5258A Sensitive Prescaler will also get the sensitivity down to the
1
mv range as well as extend the upper frequency range to 200MHz.
Gary
Gary,
Thanks for the idea. I'll look for those plugins. I actually remember
thinking about getting the video amplifier many years ago, but that was
in
the year 6 BE (before ebay).
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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