[time-nuts] HP5061B Beam Tubes

Tom Van Baak (lab) tvb at leapsecond.com
Tue Sep 24 23:19:52 UTC 2013


Some nice ones here -- google for: cesium beam tube

/tvb (iPhone)

> On Sep 24, 2013, at 9:40 AM, "Tom Miller" <tmiller at skylinenet.net> wrote:
> 
> Sure be nice if you could put them up on some photo site and let us see them.
> 
> 
> ----- Original Message ----- From: "ewkehren" <ewkehren at aol.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, September 24, 2013 12:28 PM
> Subject: Re: [time-nuts] HP5061B Beam Tubes
> 
> 
>> Did send Bill some pictures off list
>> Bert
>> 
>> 
>> 
>> 
>> Sent from Samsung tabletpaul swed <paulswedb at gmail.com> wrote:I have numbers of pix. Each is 2 MB so need another way to handle it.
>> You will get a good feel from the pictures what I did. Schematic is paper.
>> Lots of notes I would have to re-decode. It was Oct 2011.
>> Regards
>> Paul
>> WB8TSL
>> 
>> 
>>> On Mon, Sep 23, 2013 at 8:14 PM, wb6bnq <wb6bnq at cox.net> wrote:
>>> 
>>> Hi Bert,
>>> 
>>> Any chance of some high resolution photos ?
>>> 
>>> Bill....WB6BNQ
>>> 
>>> 
>>> 
>>> EWKehren at aol.com wrote:
>>> 
>>> Twelve years ago I did disassemble a regular and a high performance
>>>> tube, the only negative effect was I joined time nuts. The guts still
>>>> decorate my window sill. The only parts inside that may be temperature
>>>> sensitive are some copper wires with a clear coating. Every thing else is
>>>> metal or ceramic.
>>>> Bert Kehren
>>>> 
>>>> 
>>>> In a message dated 9/23/2013 5:44:22 P.M. Eastern Daylight Time,
>>>> john at miles.io writes:
>>>> 
>>>> I've always wanted to try baking the entire tube to vaporize any
>>>> accumulations of Cs metal outside the internal oven. Is that what you
>>>> did,
>>>> Paul? If some of the free cesium metal near the detector can be
>>>> recondensed
>>>> at the oven end, or just redistributed uniformly throughout the tube, it
>>>> might render a noisy tube usable again.
>>>> 
>>>> The point at which cesium vaporizes is 250C / 482F, and that seems like
>>>> it
>>>> could be survivable unless there are thermoplastic structures or
>>>> insulation
>>>> sleeves inside the tube for some reason. The operation might be tricky,
>>>> because while you wouldn't want to heat the tube sufficiently to vaporize
>>>> all of the remaining cesium in the internal oven, you would also need to
>>>> bake the tube for quite some time to heat its internal structures
>>>> uniformly,
>>>> since it's basically a vacuum bottle. Outgassing from various internal
>>>> materials and structures would also be a concern. Something to try with
>>>> a
>>>> tube that is otherwise ready for the scrap heap...
>>>> 
>>>> -- john, KE5FX
>>>> Miles Design LLC
>>>> 
>>>> 
>>>> 
>>>>> -----Original Message-----
>>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-
>>>>> bounces at febo.com] On Behalf Of paul swed
>>>>> Sent: Monday, September 23, 2013 12:52 PM
>>>>> To: Discussion of precise time and frequency measurement
>>>>> Subject: Re: [time-nuts] HP5061B Beam Tubes
>>>>> 
>>>>> Tom
>>>>> I added 10 degrees and used the built in temp sensor in the tube as a
>>>>> gauge. So its sort of accurate to say 10 degrees. I remember evaluating
>>>>> 
>>>>> 
>>>> the
>>>> 
>>>> 
>>>>> temp several ways.
>>>>> I did not return it to original temp as I believed at the time I was
>>>>> 
>>>>> 
>>>> baking
>>>> 
>>>> 
>>>>> out the last few Cs.
>>>>> What your saying in the threads very interesting. But don't have time to
>>>>> 
>>>>> 
>>>> go
>>>> 
>>>> 
>>>>> back and adjust or reconnect the old oven controller. I would have to
>>>>> 
>>>>> 
>>>> look
>>>> 
>>>> 
>>>>> at all of that again to see whats needed. I did this about 2 years ago
>>>>> 
>>>>> 
>>>> its
>>>> 
>>>> 
>>>>> in the time nuts archive I suspect.
>>>>> Regards
>>>>> Paul.
>>>>> 
>>>>> 
>>>> 
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>>>> 
>>> 
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