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[Amps] Vacuum Packaged NOS tubes

Subject: [Amps] Vacuum Packaged NOS tubes
From: "Pat Barthelow" <>
Date: Tue, 14 Aug 2007 09:53:03 -0700
List-post: <>

This is a memory Jogger, now:
Waaaayyyy Back at the Navy School Radio Club statioin, K6LY, I remember 
seeing some (smaller, possibly 8122 size) mil spec external anode tubes, NOS 
in our "Junk Box".  The tubes were packed in some OD green cans, about the 
size of a can of olives, that had a pop tab,  a pull on which cracked the 
seal of the top which was pealed off, and when I popped one open there was a 
powerful pop-hiss of the vacuum being broken/Filled  inside the can.

Is an outer package for  transmitting tubes that has a moderate vacuum  
applied,  an effective way to preserve tubes from damage due to slow leakage 
around the Plate/electrode seals?  Can you put your 3-500Z or other tubes in 
storage in a jar, and using some home type of vacuum source, moderately 
evacuate/seal the container, and get extended life from the tube inside?

Sincerely, Pat Barthelow
Jamesburg Earth Station  Moon Bounce Team

>From: "sulai je" <>
>To: <>
>Subject: [Amps] Project for 8122 tubes
>Date: Tue, 14 Aug 2007 13:03:08 +0300
>I had some RCA 8122 tubes in my junk box since long time. Thinking to use 
>them in a homebrew project so I start to search for an amplifier project! 
>Either to UHF or VHF . HF Googling the net yields a zero project for those 
>if any on can help with schematic and more info I will be appreciated in 
>advance .
>73s de 7z1sj Sulaiman
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