If you peruse the schematics of solid state RF PAs versus tube RF PAs,
you will find the the bias control circuitry is the most complex part of
the SS amp, often requiring more square inches of circuit diagram paper
than the rest of the amplifier. Tube amps capable of QSK can have some
complexity in their bias 'switching' circuitry, but their bias
regulation is usually trivial often consisting of just a Zener diode.
The solid state amp needs temperature compensation in it's bias
regulation. This is one area where things can go wrong much easier in a
SS amp than a tube amp.
As long as they are operated in their linear bias range, yes. Otherwise,
they get real nasty and real fast. Tube amps have a much softer bias knee.
a friend, ham radio op and commercial radio tech, suggested that solid
state amps are "cleaner" than tube amps. is that "generally" true?
|