[time-nuts] HP5061B Beam Tubes

Tom Miller tmiller at skylinenet.net
Tue Sep 24 12:40:07 EDT 2013


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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