[Amps] FW: pi to pi-L o/p matching question

[John Irwin]

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


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com