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. All copyrights (if any) are hereby acknowledged.
subjects pertaining to electronics - particularly vacuum tubes - are
like music to your ears, then this poem titled "What Is It?," from the
February 1943 edition of QST, should suit you just fine. The rhyming
words are supplied by author Frank Judd; you just need to supply the
harmony. Poems like this one were actually quite common back in the
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
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
The people near and far.
A grid can make a current
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
Now, positive potential,
When placed upon
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
Divide the oomph that grid can show
By what the plate
You will derive that magic thing
That people call the
And when you've found out all that stuff,
The next thing that they'll ask you
is plate resistance?"
Well, that is just as easy,
it true or not.
When there's a current to the plate
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
Are at a certain ratio.
And when you have determined
That ratio or rate,
Know then that you have found the
of the plate.
Now, there is still another thing
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
And if they ask you this in Quiz
Why, just think nothing
of it! Posted 12/6/2012