Is this some sort of April fools joke?
Do you know what the vacuum is (how little air is actually) inside of a
3-500?
73
Jim W7RY
On Fri, Apr 30, 2010 at 7:30 AM, Sam Carpenter
<sam@owenscommunication.com>wrote:
> I am surprised that the Russians are not doing that. In the past when I
> purchased bulk eastern block machinegun ammo, it had always been packaged
> in
> "sardine cans" that were pumped down and then painted and sealed. The stuff
> from 60 years ago still had vacuum. I suppose you could silver solder a
> refrigeration sealed system nozzle onto something and get an old pump used
> for that and draw down a near perfect vacuum. That last inch or so takes a
> long time but if you let it pump long enough, you can get there. I love
> that
> idea for 3-500 or 4-1000. There will come a day we would surely appreciate
> having done it.
> Sam,N9FUT
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Patrick Barthelow
> Sent: Friday, April 30, 2010 9:32 AM
> To: amps@contesting.com
> Subject: [Amps] Tube Storage, vacuum containers
>
>
>
>
> Years ago I saw some vacuum packaged 4CX 250B tubes, at a military base
> MARS
> station.
>
> The 250Bs, were in OD green cans about half the size of a can of chili and
> had molded plastic suspension inserts that kept the 4CX 250B softly
> floating
> in the can. The can was evacuated, and when you needed the tube, you
> pulled
> the pop top ring and pealed the top cover off the can, with the very
> recognizable tseeeeeeeeee sucking sound of the broken vacuum the instant
> you
> cracked the can open. I imagine that it would be useful for ham-consumer
> use, if one designed a similar container to store a tube in, that you
> could
> evacuate, and seal off, with ordinary (compressor in reverse) equipment.
> Maybe one of those food vacuums that suck air out of plastic food (or for
> that matter, clothing) containers. I dont think you would have to have
> anything close to a perfect, or hard vacuum to be useful. If you lowered
> the air pressure inside by several orders of magnitude, (I don't know how
> much of a vacuum is easy to produce) with simple equipment and were able to
> seal off the por
> t, with the tube inside, the differential pressure inside the tube and
> outside the hard vacuum tube would be reduced substantially, perhaps
> substantially reducing the ingress of gas inside the tube over time. If a
> ham had his set of spare 3-500Zs in the closet inside such a vacuum jar,
> (periodically re cycled with the reverse compressor to keep the vacuum,)
> the tubes, might have substantially longer shelf life, and he (and tube
> makers) might buy such a kit accessory for their tube storage.... what say?
>
> Best Regards,
> 73, de Pat Barthelow AA6EG
>
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