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

[paul swed]

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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