How to adjust DC grid bias, screen and plate voltages, RF grid-drive
volts, to provide a given plate-current operating angle, is shown in
program OPANGLE3.

It is the plate current operating angle which decides which condition
the amplifier is operated under. Program OPANGLE3 covers covers
class-AB, B and C conditions.

Download now from website below.
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Regards from Reg, G4FGQ
For Free Radio Design Software go to
http://www.btinternet.com/~g4fgq.regp
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Excellent software mine, Reg !!
Thanks and compliments.
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73's de IZ5FCY Roberto