[Milsurplus] Acorn Tube History

[Hubert Miller]

I think I can confidently answer, no modern miniature tube  bases. As I said, the most modern communications radio tube I have seen is a 12SJ7 analog.
Maybe even a copy.
Apparently Japan had some kind of Hammarlund copy too; maybe Ben can tell us what tubes it uses. Their 'HRO' designs all used the 6D6, 6C6, 41 base
tubes.
I did encounter a Japanese receiver that uses a type of super-rare 'peanut' tube, 1.5 volt tube, but it has a 5-pin miniature base.
-Hue

From: milsurplus-bounces at mailman.qth.net <milsurplus-bounces at mailman.qth.net> On Behalf Of Jim Whartenby
Sent: Tuesday, September 4, 2018 1:53 PM
To: Mike Morrow <kk5f at arrl.net>; Milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Acorn Tube History

Might be worth mentioning that when RCA acquired Victor Talking Machine Company in 1929, they also got the controlling interest in Japan Victor Company, JVC.  I cannot find any references to other Japanese companies but I haven't looked that hard either.  I assume that there may have been cross licensing agreements between RCA and other Japanese companies which might have included vacuum tube manufacturing.

All of this ended in the late 1930's as Japan prepared for war.  This seems to agree with their state of the art in vacuum tube technology, Japan was stuck in the 1930's as everyone else made serious advances.  I assume that Japanese companies in the late 1930s used octal tube bases but did they use miniature seven pin bases?

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