[Milsurplus] Acorn Tube History

[Jim Whartenby]

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?Jim I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?

      From: Mike Morrow <kk5f at earthlink.net>
 To: Milsurplus at mailman.qth.net 
 Sent: Tuesday, September 4, 2018 1:13 AM
 Subject: [Milsurplus] Acorn Tube History
   
Hue wrote:

> No, acorns were not a secret tube at any time from their
> development.

Indeed, the wikipedia article on the 955 acorn tube

 https://en.m.wikipedia.org/wiki/955_acorn_triode

cites several articles.

This one is an excellent overview and even mentions the Hitachi UN-954 plus US military and civilian gear that used acorn technology.  It states that the 955 was the first acorn, appearing in March 2935:

 http://www.antiquewireless.org/uploads/1/6/1/2/16129770/55-the_vacuum_tube.pdf

Also cited is a January 1935 article from Popular Science entitled "New Dwarf Tube Ready For Amateur":

 https://books.google.ca/books?id=lyoDAAAAMBAJ&pg=PA58&dq=acorn+tubes&hl=en&sa=X&ved=0ahUKEwjiy8_w74rbAhVKxYMKHe1EDbcQ6AEIPjAE#v=onepage&q=acorn%20tubes&f=false

Although acorns were used in many military sets, they were initially directed to the amateur market when introduced.

Mike / KK5F
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