[time-nuts] HP 5065A rubidium lifetime

[Brian Kirby]

Corby, do you think it warrants an inspection on the oven, for insurance 
?  Is it a hard procedure ?  And what would you look for ?

I bought a 5065A last summer, at a hamfest.  I had to align it at first 
to get it to lock up and then I realigned it thirty days later.  Its ran 
non-stop since and its the best standard I have in my house.  I 
constantly monitor it against a Z3801A 1 PPS and it does not appear to 
drift (took about 3 weeks to get it there).

Brian KD4FM

Corby Dawson wrote:
> I have been repairing HP 5065A for over 20 years and have never had a
> failure due to "darkening"
>
> I did have one Efratom unit years ago that the lamp envelope had darkened
> so much it was unusable.
>
> Not sure if the is the "darkening" referred to?
>
> The "killer" 5065A failures are oven failures that melt the insides, and
> a bulb that has a very low output. (The bulb envelope is still nice and
> clear in these cases.)
>
> The bulb can be replaced with some Efratom ones with varying results.
>
> Also cell flooding can occur after long storage and/or storage in high
> temperatures.
>
> This is easily cured by applying 5VDC thru a 5ohm 10watt resistor to the
> TED (thermoelectric device) in the receiver for 6 days or so.
>
> Corby Dawson 
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