[time-nuts] James Knights ovenized crystal

[Stanley Reynolds]

My search on Google did not turn up much, some pictures of james knights but not the one you have and a note that at least one octal oven had the crystal on pins 4 and 6.
 
http://www.leedsradio.com/images-odds/JamesKnights_JK013S25.JPG
http://www.leedsradio.com/images-odds/JamesKnights_JK02.JPG
Crystal maybe pins 4 and 6 (http://www.qsl.net/wa2whv/wa2whv-am.shtml)
 
 
If you could find a device that used this oven and the schematic then you would have what you need.


----- Original Message ----
From: Neville Michie <namichie at gmail.com>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Friday, March 7, 2008 2:47:00 AM
Subject: Re: [time-nuts] James Knights ovenized crystal

When I was working on military electronics in the 60s,
crystals in ovens often had octal sockets.
Inside the package there was a mechanical thermal switch
on an aluminium casing around the crystal with a heater
wrapped around it.
Two pins will be the crystal, there may be more than one shield,
two pins will run the heater, and you may have a pin from the
switched side of the heating element to run the indicator lamp
on the front panel.
good luck with getting it going,
Neville Michie

On 07/03/2008, at 6:55 PM, Bill Bearden wrote:

> I have a JK device named a "Thermystal".  The
> label says "1000 KC" 43 MMFD (any age clues
> there?:-)).  So I'm guessing it's an ovenized
> parallel-resonant crystal which is (was?) on
> frequency with 43 pf in parallel.  This is a
> fairly large unit, about 1.75 X1.25 X 3.25 inches.
> It has an ordinary octal plug on the bottom.
>
>
>
> Does anyone have any information on this or a
> similar unit?  I've had no luck with Google.  I
> especially would like to have the pin connections
> and oven voltage, and whether there is anything
> other than a crystal and oven in the box.  If
> worst comes to worst, of course, I'll open it up
> and look.
>
>
>
> Thanks,
>
>
>
> Bill, WB6JVC
>
>
>
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