[ARC5] NASM Collections Search Tool

[Geoff]

And Eimac bought H&K in order to get use of their tantalum anode patent and 
extra high vacuum and high temp glass technology.

Carl



----- Original Message ----- 
From: "Jim Haynes" <jhhaynes at earthlink.net>
To: "Michael A. Bittner" <mmab at cox.net>
Cc: <arc5 at mailman.qth.net>
Sent: Tuesday, May 27, 2014 4:39 PM
Subject: Re: [ARC5] NASM Collections Search Tool


> An interesting item in the collection is "Vacuum Radio Tube, R. H.
> Goddard Type"
>
> There was a point at which RCA was asserting its patent for a vacuum
> tube oscillator to monopolize radio transmitter manufacturing.  This
> impacted Collins.  Somehow Art Collins discovered that R. H. Goddard,
> before he got into rocket work, had devised an oscillator working on
> an entirely different principle, and patented it.
>
> Goddard's oscillator used a Y-shaped tube and magnetic deflection
> to switch the electron beam between two anodes on the arms of the Y.
> The gain was sufficient to produce oscillation.  Collins improved the
> tube to the form shown in the picture and then was able to avoid the
> RCA patent.  Another patent dispute at the same time involved the
> Heintz & Kaufmann "gammatron".  This was a special form of vacuum
> diode, with an extra electrode that could modulate the flow of plate
> current but did not involve a grid.  This is discussed in a recent
> issue of the Antique Wireless Assn. Journal.
>
> Not long after RCA gave up its attempt to monopolize transmitter
> manufacture and Collins went back to a grid tube oscillator.  Heintz
> & Kauffmann continued to use "gammatron" as a trade mark, but ceased
> manufacture of the peculiar tubes based on that principle.
>
> Jim W6JVE
>
> jhhaynes at earthlink dot net
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