[Milsurplus] Acorn Tube History

[Mike Morrow]

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