RE: Tubes labled JAN are definitely special....

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Posted by MP53 (D) on December 19, 2015 at 09:36:44

In Reply to: Tubes labled JAN are definitely special.... posted by Interstage Tranny on December 19, 2015 at 08:03:53:

You may think as you wish.

"Every JAN tube was "expected to be" humanly tested for it's high grade"

Well, the key word of "expected" allows one to fit this statement into a variety of positions. Still, the assertion that every JAN tube was tested by the tube manufacturer to ensure they met all the parameters of the military spec, for all the years that JAN tubes were issued (circa 1940's to circa 1980's) is simply not true.

My cousin worked for Sylvania in the 1950's. He claimed every tube would sit in an activation and stabilization rack as part of QC. This is very different from the QC sampling of tubes for the full array of tests - micro-phonics, balanced triodes (when applicable), and other aspects of the mili-spec.

I can recall my military buddies running a burn-in of hundreds of tubes prior to using them in military gear. Why would that be necessary if all tubes were hand selected to ensure 100% spec?

Most tubes would pass the burn-in, but keep in mind that the burn did not test for all required specs of a given tube. Also, many tubes that failed burn in allegedly circulated into the commercial tube markets and ended up in computers, broadcast stations, home amplifiers etc.

At Sylvania, if a tube failed the activation and stabilization testing, the tubes were accounted for and sent to a massive crushing machine - not unlike a junkyard crushing machine to ensure the tubes with the Sylvania name did not get into circulation.

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Follow Ups Full Thread

Topic - tubes labled JAN - Vrod 19:40:28 12/18/15 (15)

RE: tubes labled JAN - Tre' 07:53:30 12/20/15 (0)

Stands for "Joint Army-Navy" - Dave Pogue 05:51:04 12/20/15 (0)

RE: tubes labled JAN - Al Noakes 03:55:44 12/20/15 (0)

RE: tubes labled JAN - kenzo 16:12:27 12/19/15 (0)

RE: tubes labled JAN - DAK 08:28:02 12/19/15 (4)

RE: tubes labled JAN - Frihed89 13:56:29 12/19/15 (3)

RE: Was ist da C 140 crapper? nt - DAK 12:06:03 12/20/15 (2)

RE: Was ist da C 140 crapper? nt - Frihed89 06:09:10 12/21/15 (1)

RE: Was ist da C 140 crapper? nt - DAK 10:20:28 12/21/15 (0)

RE: tubes labled JAN - MP53 20:28:28 12/18/15 (0)

RE: tubes labled JAN - Alpha Al 20:27:53 12/18/15 (4)

RE: tubes labled JAN - MP53 21:46:44 12/18/15 (3)

Tubes labled JAN are definitely special.... - Interstage Tranny 08:03:53 12/19/15 (2)

RE: Tubes labled JAN are definitely special.... - MP53 09:36:44 12/19/15 (1)

RE: Tubes labled JAN are definitely special.... - Trouser Trout 21:42:13 12/21/15 (0)

Follow Ups

RE: Tubes labled JAN are definitely special.... - MP53 09:36:44 12/19/15 (1)

RE: Tubes labled JAN are definitely special.... - Trouser Trout 21:42:13 12/21/15 (0)

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