In relation to the pinebeetle pi network site
I like and use this site.
There is a lot of stuff out on pi-piL output networks in the way of how to do
it charts and computer programs .
Not so for a pi network for the input of a amplifier.
It is a lot of math to figure it out or you could copy someone Else's data from
a amp article. But not any more. The pinebeetle calc will do these quite
easily.
To calculate using "pi calculation", for cathode Z at the tube Z=75 , Z in=50
put the 75 in source impedance,the 50 in the load impedance,Q=2, freq=1.8, c
min=0, press calculate
results c1=1419pf L1=5.41 c2=1407pf
These numbers match within a pf or 2 the numbers out of the 23 edition of the
radio handbook by Bill Orr Figure 44 page 14-22
I ran most of the chart figures and all were very close. Other programs I found
on the net and the arrl "match" program could not reproduce the above numbers .
http://www.pinebeetle.net/amplifier_main.html
John kb9tc
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