[time-nuts] HP 5245L counter circa 1967 humor

[jmfranke]

For the 5245L, the Nixies pull straight out of their sockets.  They pull out 
perpendicular to the faceplate.

John  WA4WDL

--------------------------------------------------
From: "paul swed" <paulswedb at gmail.com>
Sent: Saturday, January 09, 2010 12:29 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
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 <dforbes at dakotacom.net> 
> 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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