tubes age 66
Date: Wed, 07 Feb 2001 12:33:06 +0100
Subject: Re: [R-390] military testing methods f/tubes
I found this document not via search 1311b and "go", found it at:
http://www.dscc.dla.mil/Programs/MilSpec/listdocs.asp?BasicDoc=MIL-STD-
1311
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Date: Wed, 7 Feb 2001 07:36:46 -0500
Subject: Re: [R-390] military testing methods f/tubes
Thanks for the find. Wanna have some more fun? Search on "1131b" as I did
by mistake. Lo' and behold, a document on storing and reforming capacitors.
Delving through the 656-page tube document -- not one instance of "zippo",
hmmmmmm. There's a section on "neutron irradiation of tubes" which is must
reading. We may have a serious problem, though. Will any of our tubes will
pass the "Permanence of Marking" tests on page 75? ;-)
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Date: Wed, 07 Feb 2001 20:02:12 -0600
Subject: Re: [R-390] testing tubes for noise
Its difficult to detect tube noises with simple equipment at the levels that are
significant in the RF and early IF stages. It takes the gain of the rest of the
receiver to make that noise detectable. Noise can come from loose
connections, odd grid wire geometry that leads to electron oscillation in
passage, resistive layers in the cathode emitting surface, and other sources.
None of these would show measuring current/voltage/resistance between the
elements.
That Sencor checker is probably more of a gas and grid emission tester than a
leakage tester. Certainly leakage can contribute to noise.
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Date: Fri, 09 Mar 2001 12:03:04 -0600
Subject: Re: [R-390] Tube transconductance measurement
>I...........how a tube's transconductance is measured? ..............
(14 pages)
(10 pages)
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