[Hammarlund] speaking of tubes

[Mike Lopez]

Not to be opportunistic, but I have a cache of pencil tubes I will never
use. If anyone is interested, drop me a line. Don't know what numbers off
hand. Looking to sell cheap as a lot to someone in need or use!

Mike
N8AZC

-----Original Message-----
From: Hammarlund [mailto:hammarlund-bounces at mailman.qth.net] On Behalf Of
Glen Zook via Hammarlund
Sent: Wednesday, October 01, 2014 4:45 PM
To: Mike Durff; hammarlund at mailman.qth.net
Re: [Hammarlund] speaking of tube

I read, many years ago, that entities line Western Electric and the military
kept track of the numbers of tube sockets for tube XXX. This was done to
calculate future demand.  In the case of W.E. the now revered 300 series of
triode was made from the mid 1930's until the WE Kansas city plant closed in
the 1980's ( AFAIK ).  When I toured the old Ken-Rad/GE/MPD plant in
Kentucky in the early 1990's, I was given a "commemorative" 6550. They were
the last to come off that line. I was told the military used them by the
thousands at one time. 
But, I would agree... in my lifetime (I'm 64 ) I've seen more 12AX? and 6L6
than anything else, by far. They are in almost every electric guitar
amplifier ever made. Those figures may come close to military use as they
are still being produced to this day. 
TNX, Mike, K4TQF

PS: The 6550 I have was hand made, just as they always had been,  mostly by
women. One of the rooms I saw held all the dies for the different shapes of
plates, etc. The only really "automated" process was the operation of the 22
"Sealex" machines that evacuated the tube & sealed the stem. Richardson
Electronics had purchased the Sealex machines and ordered them destroyed. I
think one was to be shipped to Richardson in the Chicago area.


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