[Milsurplus] 5686 6AS6 tube question

[jvendely at cfl.rr.com]

The 6AS6 is very similar to the 6AK5, but with the suppressor grid
brought out to a separate pin rather than being internally connected
to the cathode. It was therefore commonly used as a mixer or as a
phantastron frequency divider. 

They are often found in frequency counters, oscilloscopes, radar
equipment (as range gates), and frequency synthesized toob radios of
the late 50's and early 60's, such as the TMC SBG-1 exciter, DDR-5
receiver and others, in which they serve as phantastron and
regenerative frequency dividers. 

The 6AS6 is a dime a dozen, which is fortunate since they often must
be selected for best operation in phantastron dividers. In such cases,
highest transconductance is not necessarily a reliable indicator of
good phantastron performance. The 6AS6s I've found to be most reliable
in my DDR-5 receivers were a bunch I found of Hitachi manufacture, all
of which tested rather low for transconductance. Perhaps Hitachi knew
something other manufacturers didn't...

73,

John K9WT

	-----------------------------------------From: "Hubert Miller" 
To: "milsurplus at mailman.qth.net", "main at Army-Radios.groups.io"
Cc: 
Sent: Friday September 11 2020 11:55:20PM
Subject: [Milsurplus] 5686 6AS6 tube question

	Anyone know an equipment that uses 5686, 6AS6 tubes? I have a few of
them 

	and don't recall what I removed them from. Wondering if they were
used in 

	actual mil radios, not just test equipments.  

	-Hue Miller
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