[time-nuts] HP5061B Beam Tubes

[wb6bnq]

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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