[Milsurplus] Acorn Tube History

[Al Klase]

This reminded me of some weird paper in my radar file: 
http://www.skywaves.ar88.net/Docs/Mystery%20Ray.pdf

Somewhere I got the impression that Okura & Co. might have represented 
RCA in Japan in the time period.  Does anyone knw for sure?

Al - N3FRQ

On 9/4/2018 4:52 PM, Jim Whartenby wrote:
> 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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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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