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

Julien Goodwin time-nuts at studio442.com.au
Tue Aug 14 20:57:24 EDT 2018


After almost two more months things are looking much more promising.

The ion pump current is down, and it's no longer throwing the pump
overcurrent alarm. so I'm going to try and get it shipped home to Australia.

Here's the status from just a few minutes ago:
https://julien.studio442.com.au/images/cs4000_monitor3-2018-08-14.png

On 25/06/18 11:52, Julien Goodwin 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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