tubes age 99
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Subject: RE: [R-390] TUBES
Date: Fri, 15 Feb 2002 09:38:47 -0800
When I started in the electronics industry in the mid 70's, among other
products, I sold receiving, industrial, camera and specialty tubes (Amperex,
Amperite, Eimac, Genelec, Mullard, RCA, Sylvania and probably a few I've
forgotten). Only RCA and Sylvania manufactured receiving and industrial tubes
in North America (U.S. and Mexico). RCA dropped out of that business in the
early 80's. I believe Richardson bought their facility. I seem to recall Sylvania
also exited the business during that time frame but I can't swear to it.
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Subject: Re: [R-390] TUBES
Date: Fri, 15 Feb 2002 14:39:21 -0500
>>In the dim recesses of my fading memory, I seem to recall plans
>>announced about five years ago by Western Electric
All this talk of tubes had me thinking over noon. I just returned from lunch with
the LTC that is the commander of our regional ROTC units based here at the
college I work at. Earlier I learned he was a "signals" officer and he's been very
helpful scrounging parts for me for various receivers, including my R-390A. I
asked about the military supply of vacuum tubes and he tells me that they had a
warehouse full of new tubes at the last base he was assigned to two years
ago. He informed me that many of the tubes were routinely surplussed as they
got older and rotated with fresh stock. He informs me that many of the current
tubes in US Army stock were made by Philips in Germany. Must be NATO
purchases ??? Interestingly he was in the Gulf and actually had to request R-
390A's be sent there from Germany. Apparent;ly according to him some of their
sofisticated receivers had trouble with static damage due to charges from all
the blowing sand ??? I don't know if he's kidding me or not on that..... but he
sure is familiar with the R-390A for a guy that entered service probably in the
late 1970's or early 80's.
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Date: Fri, 15 Feb 2002 13:56:59 -0600
Subject: Re: [R-390] TUBES
I think he's _not_ kidding, based on the word I've got from some troops who
were there. You'd think that W-J and the other premium military manufacturers
would stick a 1 Meg resistor between the antenna connector center pin and
ground. I guess that's just too easy and makes too much sense.
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