[time-nuts] HP 5061A Cesium Beam Std

[Scott McGrath]

For a tube which has not been powered up for a long time it can take days or weeks for the ion pump to bring the vacuum back to a normal state.   

Replacement tubes are available but they are breathtakingly expensive on the order of 22k 

It's a crapshoot with old Cs tubes but for $400 I'd be inclined to keep it and acquire over time the items needed to support it like HVPS etc


Content by Scott
Typos by Siri

> On Feb 9, 2017, at 8:21 PM, David Smith <w6te at msn.com> wrote:
> 
> 
> Hello Time Nuts Friends,
> 
> I have acquired an HP 5061A off of EBAY and I believe the cesium beam tube may be bad. The ion pump meter pins out and never comes down to a reasonable level. I don’t have an external HVPS to check the tube as suggested in the manual. I’m thinking the worst here… that the tube is probably bad. The seller listed it “For Parts” and the usual “I have no way of checking it.” Fortunately, he has a 14 day return policy. He’s offered me $400 to keep it. I have $725 in it.
> 
> My question to the group is… are there replacement tubes available? Any suggestions on what to do with it if I can’t get a replacement tube?
> 
> Thanks in advance,
> 
> Dave Smith / W6TE
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> 
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