[time-nuts] How to open solder-sealed OCXOs?

[J. L. Trantham]

I've never opened an OCXO but I have opened several sealed HV power supplies
used on HP 5061A and 5061B CS Standards.  These supplies are mounted by four
6-32 screw studs which make for easy 'holding' in a lightly tightened vise.
I used a very focused hand held propane torch to go around the very base of
the supply while grabbing the top with a large set of slip joint pliers and
applying a gentle lifting/rocking motion.  You have to heat up the entire
circumference but it doesn't take too long and there was never any internal
or external damage.  Very easy to reassemble in the original configuration
as well.

I also remember a thread several months ago about opening a Morion MV89A
OCXO to repair a loose solder joint on the output.  I don't recall what
their method was but you should be able to find it in the archive.  I think
it, too, was an 'unsoldering' approach.

Hope this helps.

Good luck.

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Stewart Cobb
Sent: Sunday, February 02, 2014 1:37 AM
To: time-nuts at febo.com
Subject: [time-nuts] How to open solder-sealed OCXOs?

What's the best way to open an OCXO in the typical solder-sealed tinned
steel can?  I don't mind destroying the can itself, as long as the innards
are not harmed. The goal is to run some experiments with thermal impedance
as discussed here last week, and to ovenize parts of the EFC controller for
better stability.

Cheers!
--Stu
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