OFF TOPIC, SORT OF

[Roy Morgan]

At 02:54 AM 10/7/2007, Murray Grandy wrote:
>DOES ANYONE KNOW OF A WAY OF TESTING TRANSMITTER TUBES SUCH AS 4-400. WAS 
>THERE EVER ANYTHING IN ANY OF THE ARRL HANDBOOKS.

Murray and others,

The advice that testing a tube in a transmitter meant to use it is quite 
good advice.  Although sometimes you just don't have such a transmitter handy.

Yes, there was advice on testing transmitting tubes published.  I can't 
remember if it was the GE Ham News or the RCA HAM Tips.  There was a 
special issue that presented about four different ways to test transmitting 
tubes.

One method involved a self excited oscillator with appropriate dummy load 
that would run the tube at something like 17 mc.  If I remember right, you 
would run the tube at pretty much normal conditions (for a self excited 
oscillator, which we almost never do nowadays) and then reduce the filament 
voltage (for thoriated tungsten tubes) and see where the power output 
dropped off.

Most of us have not built such a tester yet.

Roy



- Roy Morgan, K1LKY since 1959 - Keep 'em Glowing
13033 Downey Mill Road, Lovettsville, VA 20180
Phone 540-822-5911   Cell 301-928-7794
Work: Voice: 301-975-3254,  Fax: 301-975-6097
roy.morgan at nist.gov --  

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