[time-nuts] Description - GR 1120-AB Frequency Standard
Jim Hall
perseidjh at hotmail.com
Wed Sep 3 22:06:32 EDT 2008
Russ,
Sorry but the only thermoswitches he has or knows about are for 60 or 70
degrees C units he has. I think he got his switches from GR crystal ovens
used for BC transmitters. I imagine their requirements were less stringent
than the "standards lab" standard you are rebuilding but then again you
never know.
Most of the thermoswitches he has were manufactured by "Precision" or at
least that was written on each of them. Another thermoswitch was
manufactured by "H inside a diamond, B inside a diamond". I think both the
GR thermoswitches were manufactured by Precision. I wonder if you could
search on eBay or other sites for that name if that is who manufactured
yours. Probably a long shot but just wondering.
Jim
--------------------------------------------------
From: <wa3frp at aol.com>
Sent: Wednesday, September 03, 2008 7:55 PM
To: <time-nuts at febo.com>
Subject: Re: [time-nuts] Description - GR 1120-AB Frequency Standard
> Jim,
>
> Thanks for following up on this. The thermoswitch that I'm looking for
> closes on reaching a trip temperature of 78C. The original unit was
> made by Princo. I wonder if your friend could tell me if he has any
> leads on a 78C thermoswitch.
>
> Thanks again,
>
> Russ
>
>
>
>
>
>
>
> -----Original Message-----
> From: Jim Hall <perseidjh at hotmail.com>
> To: time-nuts at febo.com
> Sent: Wed, 3 Sep 2008 8:04 pm
> Subject: [time-nuts] Description - GR 1120-AB Frequency Standard
>
>
>
> Today I visited a friend who collects all sorts of old electronics and
> asked him
> about mercury thermometer sensors. Turns out he had several from
> various GR
> pieces of equipment. Some are in a straight shape with "trip"
> temperatures of
> 50 or 60 degrees C. One is at a 90 degree angle with a 60 degree C
> trip point.
> I'm sure it is a very long shot but I wondered if any of these might
> work for
> the frequency standard you are rebuilding.
>
> Most of the above temperature sensors were built by "Precision". I
> have the
> part numbers.
>
> What do you think? Does it sound like any of these could be
> replacements for
> your unit?
>
> Regards,
>
> Jim
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