[time-nuts] Symmetricom (Datum/Microsemi) CS tubes after storage

[paul swed]

Julien
So are you able to carefully monitor the ion pump current?

On Mon, Jun 25, 2018 at 4:06 PM, paul swed <paulswedb at gmail.com> wrote:

> Julien
> Wow chunk of money is correct for a new tube if even available.
> But shipping south will be very costly.
> Regards
> Paul
>
> On Mon, Jun 25, 2018 at 2:52 PM, Julien Goodwin <
> time-nuts at studio442.com.au> wrote:
>
>> Thanks for the on & off-list responses folk.
>>
>> Sadly I didn't have a usable RS232 adapter set when I first powered this
>> on a month back. It's actually on a desk I'm borrowing in Sunnyvale[1]
>> (California), hoping to determine if it's worth the significant cost of
>> shipping it home to Sydney[2].
>>
>> I don't have a 3kV supply myself, nor do I have a lab where I'd feel
>> safe messing with that sort of thing (the labs I could borrow around
>> here are all shared, and 3kV is not something leave where random people
>> could touch).
>>
>> I guess I'll leave it for another month or so, hopefully in that time
>> I'll be able to see if there's an improving trend.
>>
>> 1: Just a few blocks from Stanford Research who, by the way, I'm not
>> having any luck trying get some replacement feet from, for some kit that
>> used to be rack mounted.
>>
>> 2: It's much cheaper if I were to pull the tube, since I could then just
>> take it as luggage on a flight home. But it'd make more sense to have it
>> dropped off to Microsemi for a tube swap, and have them ship it back to
>> Australia for me. Either way, that's a chunk of money I'm not sure I
>> want to pay right now.
>>
>> On 20/06/18 16:52, paul swed wrote:
>> > Julien
>> > Do you see any reduction in the current. It may be slight. If so time is
>> > your friend. Let it cook.
>> > If not KE5FX is a time nut also. Here is what he did.
>> > http://www.ke5fx.com/cs.htm
>> > Granted you need a 3KV supply and it is hazardous. I am not an expert on
>> > your tube.
>> > Others may have better insights.
>> > Good luck.
>> > Regards
>> > Paul.
>> >
>> > On Wed, Jun 20, 2018 at 7:32 PM, Julien Goodwin <
>> time-nuts at studio442.com.au>
>> > wrote:
>> >
>> >> I recently picked up a used Cs clock (Symmetricom labelled Cs4000).
>> >>
>> >> Sadly, it turns out to have been stored for about a year (at least, a
>> >> year since it was last claimed to lock) and doesn't appear to be
>> locking.
>> >>
>> >> I've had it on for about a month now, and ion pump current is still
>> >> quite high[1].
>> >>
>> >> Given the unit is now over 10 years since manufacture, with power on
>> >> hours of ~5 years I'm guessing this now probably has a dead tube, and
>> >> unless I want to spring for a new tube I have a paperweight.
>> >>
>> >> 1: Monitor3 display for the unit including the alarm window:
>> >> https://julien.studio442.com.au/images/cs4000_monitor3.png
>> >> (That's the set that fires after alarms are cleared)
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