[Milsurplus] 211 Tube Note

[Mike Feher]

Mike - Even that could not possibly be true. There is no way you can pull
7.5 amps of RF out of that tube. Remember, simply put, P out is still
basically I^2 * R. Just does not add up. - Mike

 
 
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
 
 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Michael Tauson
Sent: Saturday, March 22, 2008 11:35 PM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] 211 Tube Note

Him, folks,

On Sat, Mar 22, 2008 at 11:15 AM, Hue Miller <kargo_cult at msn.com> wrote:

> at hgher frequencies. In any case, the radio frequency
> grid and plate currents of the UV-211 Radiotron must
> never exceed 7.5 amperes."

Um, they're talking about RF current, not DC.  The 1937 manual says
that, with 1250 volts on the plate, the maximum DC grid current is 50
ma but the maximum RF grid current is 7.5 amps in class C RF amp or
oscillator radio telegraphy use.  Wheee!  That's a whole seabag full
of drive for 130 watts out.

This manual also cranks the output frequency for 100% output to 15MCs
with attendant reductions above that.

Best regards,

Michael, WH7HG
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