[time-nuts] HP 5061A Cesium Beam Std

[cdelect]

David,

I would let it set on the peg in Cs off mode for a fewdays.

It can take a long time for some tubes.

An external HV supply can also be tried if it does not come down in a few
days.

If it does come down turn the switch to operate to turn the filaments on.

The ion pump should peg again, that's OK it will slowly cycle up and down
as the filaments de-gas.

Eventually the pump will come down for good and the tube will warm up all
the way.

Then you can test and see if it has some life.

Does your unit have the 10811 style oscillator?

Is it  a standard tube or a high performance? What is the part # like
1924-00156?

I might have a good used tube available if it does turn out to be dead.

Cheers,

Corby

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] HP 5061A Cesium Beam Std

[John Miles]

> Search the list for what Paul and I did. There is a web page where someone
> did the same forced pump down. If all the voltage s are good you have
> nothing to loose. You are going to need a "real" high voltage source.

That may have been my page here: http://www.ke5fx.com/cs.htm 

Bertan HV supplies are reasonably common on eBay for less than $50.  Worth a 
try before giving up on the tube.

-- john, KE5FX
Miles Design LLC

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [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  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
> Sent from Mail for Windows 10
> 
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] HP 5061A Cesium Beam Std

[Pete Lancashire]

Search the list for what Paul and I did. There is a web page where someone
did the same forced pump down. If all the voltage s are good you have
nothing to loose. You are going to need a "real" high voltage source.



On Feb 9, 2017 6:01 PM, "David Smith"  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
> Sent from Mail for
> Windows 10
>
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Re: [time-nuts] HP 5061A Cesium Beam Std

[J. L. Trantham]

Dave,

The 'value' of the unit may be that of the 'parts'.  Are there any options?

I have nine 5061A'a and B's and it has been my experience that if it has the 
'High Performance Cs Tube', option 004, it likely has a dead tube.

If it has option 001, 002, or 003 (clock, battery backup, or both), there is 
likely some additional 'value' in the unit from the perspective of 'spare 
parts'.  Absent option 004, the tube might be 'resurrectable' if you have the 
proper equipment, including a HV power supply capable of 4KV+ voltage with 
appropriate current.  Even if so, the 'survival' after the 'resurrection' might 
be very limited.

I have a unit that I am able to resurrect with an external HV supply of about 5 
KV over a couple of days but, eventually, it becomes 'non-op' as the ion pump 
'pegs out'.  Not completely sure that this is not a failure of the A18 assembly.

If there are 'spare' tubes available, I would love to hear about them.

Hope this helps.

Joe

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David Smith
Sent: Thursday, February 09, 2017 7:22 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5061A Cesium Beam Std


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
Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

___
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

[time-nuts] HP 5061A Cesium Beam Std

[David Smith]

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
Sent from Mail for Windows 10

___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.