[Milsurplus] 211 Tube Note

[Meir-WF2U]

The 7.5 amps is combined plate and grid current. 
In triodes, the simplest and safest way to meter the tube is to measure the
cathode current, which is the combined plate and grid current. No HV needs
to be fed into the meter this way. Normally, the more grid current, the
higher the plate current. 

73, Meir WF2U
Landrum, SC

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Hue Miller
Sent: Saturday, March 22, 2008 5:15 PM
To: milsurplus at mailman.qth.net
Subject: [Milsurplus] 211 Tube Note

>From RCA booklet "Radiotron UV-211" dated Jan. 1932:

"Radiotron UV-211 is not recommended for use at 
frequencies greater than 3000 kilocycles. There are 
other types of Radiotrons especially designed for use
at hgher frequencies. In any case, the radio frequency
grid and plate currents of the UV-211 Radiotron must
never exceed 7.5 amperes."

No other explanation! However, i'm sure the grid would
not stand 7.5 amps!  -Hue Miller
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