[time-nuts] HP 5065A rubidium lifetime

Corby Dawson cdelect at juno.com
Fri Mar 19 21:10:42 UTC 2010


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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