[time-nuts] time-nuts Digest, Vol 155, Issue 27

Jeff Hook jeffhook at comcast.net
Fri Jun 16 16:05:00 UTC 2017


Tv jjjjjj

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-----Original Message-----
From: "time-nuts-request at febo.com" <time-nuts-request at febo.com>
Sent: ‎6/‎16/‎2017 11:00 AM
To: "time-nuts at febo.com" <time-nuts at febo.com>
Subject: time-nuts Digest, Vol 155, Issue 27

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Today's Topics:

   1. Re: Powering up a long inactive 5061A (Pete Lancashire)
   2. Re: Powering up a long inactive 5061A (Scott McGrath)
   3. Re: Powering up a long inactive 5061A (paul swed)
   4. Re: Powering up a long inactive 5061A (Bill Hawkins)
   5. Re: Powering up a long inactive 5061A (Charles Steinmetz)
   6. The clocks at Windsor Castle, UK (Bill Hawkins)
   7. Re: The clocks at Windsor Castle, UK (Bob kb8tq)


----------------------------------------------------------------------

Message: 1
Date: Thu, 15 Jun 2017 11:23:48 -0700
From: Pete Lancashire <pete at petelancashire.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Powering up a long inactive 5061A
Message-ID:
	<CAA-F0u_DbBDXUDY_XjCwLrQ_9mFPa4vtukffQaF3WFv2Dki8RA at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Did' not see the 'variac'

A variable autotransfomer more then likely we burn up something in the
power supply. This applies to pretty much all high equipment
that is more than just TV Repair shop gear or anything designed by HP after
around the mid to late 60's.

If power supply regulation exists, and is anything more then a gas
discharge regulator, don't use a variac.

On Wed, Jun 14, 2017 at 11:02 PM, Hugh Blemings <hugh at blemings.org> wrote:

> Hi,
>
> I've been assisting with the cataloguing and, where possible, testing of a
> bunch of test equipment from a deceased estate.
>
> One of the items is a 5061A which best I can tell has not been powered on
> for over a decade.  The High Performance tube has a warranty expiration
> date of 1988.  Serial number is 1936A01567 and has Option 01 and 04 and has
> the digital rather than analogue clock.  Minor but it's missing the bottom
> cover.
>
> My intuition is to set it to one side until I can become familiar with the
> operating manual and potentially bring power up to it slowly with a Variac
> or similar.
>
> I'd be curious as to the time-nuts view on whether this degree of caution
> warranted ?
>
> I suspect the Cs tube is long dead, but maybe I'll be pleasantly surprised
> ?
>
> Would welcome feedback on sensible/cautious first steps with the unit -
> initial need, if possible, is a "simple" go/no go/does it power on ?
>
> Cheers/73
> Hugh
> VK3YYZ/AD5RV
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> ailman/listinfo/time-nuts
> and follow the instructions there.
>


------------------------------

Message: 2
Date: Thu, 15 Jun 2017 15:20:10 -0400
From: Scott McGrath <scmcgrath at gmail.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Powering up a long inactive 5061A
Message-ID: <74F5EAEA-539D-4A2F-8548-3D1F0C25091F at gmail.com>
Content-Type: text/plain;	charset=us-ascii

First you will need to power it up in Cs Off state and monitor the ion pump current by periodically switching to Cs On

If you have a possibly good tube ion pump current should drop to zero in a few days to 3 weeks

Thats your first step

> On Jun 15, 2017, at 2:02 AM, Hugh Blemings <hugh at blemings.org> wrote:
> 
> Hi,
> 
> I've been assisting with the cataloguing and, where possible, testing of a bunch of test equipment from a deceased estate.
> 
> One of the items is a 5061A which best I can tell has not been powered on for over a decade.  The High Performance tube has a warranty expiration date of 1988.  Serial number is 1936A01567 and has Option 01 and 04 and has the digital rather than analogue clock.  Minor but it's missing the bottom cover.
> 
> My intuition is to set it to one side until I can become familiar with the operating manual and potentially bring power up to it slowly with a Variac or similar.
> 
> I'd be curious as to the time-nuts view on whether this degree of caution warranted ?
> 
> I suspect the Cs tube is long dead, but maybe I'll be pleasantly surprised ?
> 
> Would welcome feedback on sensible/cautious first steps with the unit - initial need, if possible, is a "simple" go/no go/does it power on ?
> 
> Cheers/73
> Hugh
> VK3YYZ/AD5RV
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.


------------------------------

Message: 3
Date: Thu, 15 Jun 2017 16:16:17 -0400
From: paul swed <paulswedb at gmail.com>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Powering up a long inactive 5061A
Message-ID:
	<CAD2JfAhryT0UgkALK3F7XNjyz0RqpJ-XCJJOFOXSsicfgS5FnQ at mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Scott far better then my response. Right to the point.
Regards
Paul
WB8TSL

On Thu, Jun 15, 2017 at 3:20 PM, Scott McGrath <scmcgrath at gmail.com> wrote:

> First you will need to power it up in Cs Off state and monitor the ion
> pump current by periodically switching to Cs On
>
> If you have a possibly good tube ion pump current should drop to zero in a
> few days to 3 weeks
>
> Thats your first step
>
> > On Jun 15, 2017, at 2:02 AM, Hugh Blemings <hugh at blemings.org> wrote:
> >
> > Hi,
> >
> > I've been assisting with the cataloguing and, where possible, testing of
> a bunch of test equipment from a deceased estate.
> >
> > One of the items is a 5061A which best I can tell has not been powered
> on for over a decade.  The High Performance tube has a warranty expiration
> date of 1988.  Serial number is 1936A01567 and has Option 01 and 04 and has
> the digital rather than analogue clock.  Minor but it's missing the bottom
> cover.
> >
> > My intuition is to set it to one side until I can become familiar with
> the operating manual and potentially bring power up to it slowly with a
> Variac or similar.
> >
> > I'd be curious as to the time-nuts view on whether this degree of
> caution warranted ?
> >
> > I suspect the Cs tube is long dead, but maybe I'll be pleasantly
> surprised ?
> >
> > Would welcome feedback on sensible/cautious first steps with the unit -
> initial need, if possible, is a "simple" go/no go/does it power on ?
> >
> > Cheers/73
> > Hugh
> > VK3YYZ/AD5RV
> >
> > _______________________________________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> > and follow the instructions there.
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>


------------------------------

Message: 4
Date: Thu, 15 Jun 2017 17:27:57 -0500
From: "Bill Hawkins" <bill.iaxs at pobox.com>
To: "'Discussion of precise time and frequency measurement'"
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Powering up a long inactive 5061A
Message-ID: <91FE6B8569614722A5E51C41C5EDE1F2 at system072>
Content-Type: text/plain;	charset="us-ascii"

The first thing you should do is to check the condition of the power
fuse. If it is blown or missing, you have some work to do looking for
the cause of the fuse trouble.

If you are concerned about old electrolytics in the power supply, and
you can't check them for capacitance when off, there is an alternative
to using a Variac.

Cut one wire of an extension cord in order to put a lamp socket in
series with the load. If line power is 120 volts, put a 100 watt bulb in
the socket. Turn on the unit and be ready to turn it off again if the
bulb lights at near or full brilliance. If it does, you have the same
work to do as if the fuse had blown. If it starts bright and dims, you
may be forming electrolytics.

If the bulb maintains the same brightness, try a bigger bulb - or
disconnect the ovens.

You definitely need to read the part about running the ion pump.

Bill Hawkins

Disclaimer: I haven't tried this on an HP5061. You could still damage
the switchers. You can't detect open capacitors this way.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Hugh
Blemings
Sent: Thursday, June 15, 2017 1:02 AM

My intuition is to set it to one side until I can become familiar with
the operating manual and potentially bring power up to it slowly with a
Variac or similar.




------------------------------

Message: 5
Date: Thu, 15 Jun 2017 18:33:25 -0400
From: Charles Steinmetz <csteinmetz at yandex.com>
To: time-nuts at febo.com
Subject: Re: [time-nuts] Powering up a long inactive 5061A
Message-ID: <59430B35.4030905 at yandex.com>
Content-Type: text/plain; charset=utf-8; format=flowed

Hugh wrote:

> Would welcome feedback on sensible/cautious first steps with the unit - initial need, if possible, is a "simple" go/no go/does it power on ?

You may find the information on this page helpful:

<http://www.ko4bb.com/doku2015/doku.php?id=precision_timing:how_to_check_an_hp5061a_cesium_standard>

Best regards,

Charles




------------------------------

Message: 6
Date: Thu, 15 Jun 2017 21:37:55 -0500
From: "Bill Hawkins" <bill.iaxs at pobox.com>
To: "'Discussion of precise time and frequency measurement'"
	<time-nuts at febo.com>
Subject: [time-nuts] The clocks at Windsor Castle, UK
Message-ID: <A33B1572E7204E78823D3FCC5156BD0D at system072>
Content-Type: text/plain;	charset="us-ascii"

Happened to watch a PBS/BBC program called "Queen's Castle" episode 102
- Four Seasons, that was filmed in 2005 at Windsor, not Buckingham.

One of the segments was about the castle timekeeper, Steve Davison. He's
responsible for 450 clocks, some 300 years old. His biggest challenge is
the end of British Summer Time, when each clock must be advanced 11
hours, stopping until striking finishes. Old clocks were not designed
for Fall Back. Takes him 16 hours.

There was a brief shot of his workshop, with a clock repair in progress.
No sign of a time standard. No discussion of leap seconds, either.

Tried to find him, but only found a 2013 ad for a time keeper to
maintain 1000 clocks in various castles.

Hope that wasn't too far off topic.

Bill Hawkins



------------------------------

Message: 7
Date: Fri, 16 Jun 2017 09:09:48 -0400
From: Bob kb8tq <kb8tq at n1k.org>
To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] The clocks at Windsor Castle, UK
Message-ID: <CEAAF703-C663-4ACA-AEE9-DE223FC4F62B at n1k.org>
Content-Type: text/plain; charset=utf-8

Hi

I would claim that anybody with 450 clocks to tend is indeed a Time Nut ….:)

Bob

> On Jun 15, 2017, at 10:37 PM, Bill Hawkins <bill.iaxs at pobox.com> wrote:
> 
> Happened to watch a PBS/BBC program called "Queen's Castle" episode 102
> - Four Seasons, that was filmed in 2005 at Windsor, not Buckingham.
> 
> One of the segments was about the castle timekeeper, Steve Davison. He's
> responsible for 450 clocks, some 300 years old. His biggest challenge is
> the end of British Summer Time, when each clock must be advanced 11
> hours, stopping until striking finishes. Old clocks were not designed
> for Fall Back. Takes him 16 hours.
> 
> There was a brief shot of his workshop, with a clock repair in progress.
> No sign of a time standard. No discussion of leap seconds, either.
> 
> Tried to find him, but only found a 2013 ad for a time keeper to
> maintain 1000 clocks in various castles.
> 
> Hope that wasn't too far off topic.
> 
> Bill Hawkins
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.



------------------------------

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