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February 1943 QST
 [Table
of Contents]These articles are scanned and OCRed from old editions of the
ARRL's QST magazine. Here is a list of the
QST articles I have already posted. As time permits, I will
be glad to scan articles for you. All copyrights (if any) are hereby acknowledged.
In fact if you look through the list of articles that I have posted from vintage QSTs, you will find half a dozen or more. See all available vintage QST articles. What Is It? BY Frank E. Judd What is the thing that's in a tube That people call the mu? It is a silly-sounding word - What does the blamed thing do? Well, listen, child, and you shall hear How simple such things are, And you may then astonish The people near and far. A grid can make a current flow, Or stop it, if you please; It only needs a voltage To accelerate or cease. This current flow is to the plate, And from the tube's cathode. 'Tis so in multielement Or simplified diode. Now, positive potential, When placed upon a plate, Can also make a current flow But at a lesser rate. Compared with what the grid can do Its pull is pretty lame. The grid can make a bigger flow With current just the same. Divide the oomph that grid can show By what the plate can do: You will derive that magic thing That people call the mu. And when you've found out all that stuff, Without or with assistance, The next thing that they'll ask you Is, "What is plate resistance?" Well, that is just as easy, Believe it true or not. When there's a current to the plate There's voltage on the spot. And when you've done that little thing At school or in your patio, You'll find that volt and current change Are at a certain ratio. And when you have determined That ratio or rate, Know then that you have found the Resistance of the plate. Now, there is still another thing I mention with reluctance. It is a sixty-dollar word - They call it transconductance. It is the ratio of the change In current to the plate Divided by the voltage change Back at the grid, they state. Now do not be alarmed by this; Just place yourself above it. And if they ask you this in Quiz Why, just think nothing of it! Posted 12/6/2012 | ||||||
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