[time-nuts] 5071A tube evaluation

[David Welch]

I was wondering about a 5061b that I got from a government liquidation
auction..I have had it locked for months now I just checked the mult meter,
reads 41 is this tube end of life as you were saying or are these diff
scale..I dont have any manuals for any ofthe 5061 a or b   ----- Original
Message ----- 
From: "corby d dawson" <cdelect at juno.com>
To: <time-nuts at febo.com>
Sent: Saturday, December 22, 2007 9:09 AM
Subject: [time-nuts] 5071A tube evaluation


> David,
>
> If the unit has been stored for years then the first time it is plugged
> in the ion pump current displayed will be high and the Cs oven will be
> disabled.
>
> When the ion pump current drops the oven will turn on momentarily and
> outgas. This will cause the ion pump current to rise and cut off the oven
> again.
>
> This cycle will continue (sometimes for many hours) until finally the
> oven will stay on.
>
> The after 15 minutes or so the unit should lock.
>
> Now monitor the electron multiplier voltage for a week or so. It
> hopefully will start out well below 2500 Volts and remain stable.
>
> If should remain stable and not exibit a constant rise (over a week or
> so, it can show slow variations over months).
>
> The amplifer gains should also be low. (for the default starting values
> look at the gains before the unit warms up.)
>
> A depleted tube will show a rapid rise up to the maximum voltage and
> after the amplfier gains also rise to the top to compensate the unit will
> fault out.
>
> If the mainframe has a problem or you have a tube not in an instrument I
> have a stand alone Cesium tube tester that I charge a small fee to test
> tubes in.
>
> Hope this helps,
>
> Merry Christmas!
>
> Corby Dawson
>
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