Re: 204 Tube Data

• To: tesla-at-pupman-dot-com
• Subject: Re: 204 Tube Data
• From: "Ed Phillips" <evp-at-pacbell-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 13 Feb 2000 11:49:49 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: Parpp807-at-aol-dot-com
> 
> The 204 is a transmitting triode. Probably of historical interest because of
> the
> manufacturer and the unusual pinout.
> 
> Fil volts     11 V
> Fil Amps    3.05 A
> Plate Diss  250 W
> Plate V        2500 V
> Plate Amps   275 mA
> 
> A mid-1980s price from Richardson was $860.
> Should make a good VTTC
> 
> Happy day,
> Ralph Zekelman

	The 204 is indeed of historical interest.  It had its origins in the
World War 1 "P" tube developed by GE circa 1918 and its improved
variant, the VT-10.  The latter, at least, used the same socket as the
the later UV-204 and its successor, the UV-204A.  The UV-204 was offered
for sale in March, 1921 by the Radio Corporation of America, which at
that time had no manufacturing facility but sold products made by GE and
Westinghouse.  As advertised in the April, 1921 QST, the UV-204 cost
$110.00, with an extra $2.00 for the "end mountings".  It was rated at a
plate dissipation of 250 watts and the pure tungsten filament took a
current of 15 amperes at 12 volts.  (Pure tungsten filaments could be
operated at varying filament currents with corresponding variation in
emission current.)  The UV-204A, which came along a couple of years
later, used a thoriated tungsten filament with much greater emission at
lower filament power.

	Enough about the 204!

Ed

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