[Test-Equipment] Help ID NBS (aka NIST) Noise Source

[Larry Will]

Hi Dennis,

My looking at your pix appears to show that indeed there is a noise 
source in the cage (The "N" connector is labeled noise output) while 
the rear panel additions simply take what is probably the filament 
voltage and allow it to be switched to the rear panel 2 pin connector 
for use with an eternal source.

So unless the tube is gone in the cage, you more than likelyhave a 
working unit.

Larry W3LW

At 12:59 AM 1/4/2010, you wrote:
>Good evening,
>
>        I acquired the above noise source on a lark recently, simply
>because I like such things, and the "cool" factor is way high for me
>given the Radioastronomy and NBS linkages.  If it turns out to be
>useful in the shop, so much the better.  :)   I've taken some pictures
>of the inside and outside and posted them on Picassa Web.  Have a
>look.  The link is:
>
>
>http://picasaweb.google.com/Sacramento.Cyclist/NBSNoiseSource?feat=directlink
>
>        It was apparently made by Aerospace Research Inc. of Boston,
>Mass.  There is a date on the inside meter case of May, 1964.  The
>dynamo label on the front panel says checked in 1971.  I can find no
>mention of that company anywhere.  Anyone know what became of
>Aerospace Research?  Before I opened it up, I figured it would have a
>tube.  But, I don't think it does...unless there is a very small one
>inside the internal cage which you can see against the front panel on
>the inside.  Over all, the thing is in remarkable shape.  The range
>switch is quite stiff though.  I have not tried to power it on.
>
>        If anyone recognizes this thing, please let me know.
>
>        Have a look.
>
>--
>I've been wondering lately..."Where am I going and why AM I in this
>hand basket??"
>
>-------------------------
>Dennis L. Wade
>KG6ZI
>Carmichael, CA
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