[Amps] Size of Parasitic Chokes

[Roger]

How do you determine the size of a parasitic choke for a given tube 
other than using "The Handbook" as a starting point and going with "cut 
and try" from there?
Say with a YC156, 4CX3000A7, or 4CX5000?
Unfortunately sockets for those 4CX tubes are a tad pricey (Look like 
the socket for a 4CX1500B on steroids.) I don't see all that many of the 
3000's any more, but I have one and know of possibly a couple good ones 
for a reasonable price. I think that socket (and 360 watt filament) keep 
the price more reasonable. Course it takes a rather chunky filament 
transformer too.  That tube would make some nice 6 meter and 2-meter amps!

73

Roger (K8RI)