[Milsurplus] VT-127A tube socket

[Ray Chase]

In most applications the mounting was special, part of the design of the 
transmitter.  Most were used in a "ring" oscillator as part of a radar 
transmitter.  A ring oscillator uses an even number of tubes, say from 4 to 
16 connected somewhat like a push pull/push pull etc.  The most famous use 
was in the first Army Searchlight radar the SCR-268 that used 16 tubes.  It 
was responsible for so many still being around as the set consumed them 
pretty rapidly so the supply system was full of them.  It was based on a 
standard Eimac design, cannot remember the number right now.  The opposing 
grid and plate connections were to provide support for the elements plus 
they were handy in the ring configured transmitter to connect to the tuned 
elements between each tube.  They operated at several hundred Mhz. with many 
kilowatts of pulsed power.  Heady stuff in 1942.  There are several military 
histories that describe it and I have pictures of the SCR-268 installation, 
unfortunately I am laid up right now but if you still need pictures, get 
back to me in a week or two and I can accommodate you.
Ray Chase
----- Original Message ----- 
From: "Ralph Cameron" <ramcam at magma.ca>
To: <milsurplus at mailman.qth.net>
Sent: Monday, March 14, 2011 2:17 PM
Subject: [Milsurplus] VT-127A tube socket


> How was the VT-127A tube mounted. As you may recall it has two filament
> pins on the base and two grid pins horizontally as well as two
> horizontal plate connections. Did this tube fit into a fixture of some
> kind?
>
> Am trying to mount one and can make a fixture but have never seen where
> it was mounted in the equipment in which it was used.
> Thanks
>
> Ralph
> VE3BBM
>
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