I suppose if you figure tube rigs have been around many years longer than
solid state rig, they probably are cleaner due to less exposure to dirt ,
dust
and smoke. :)
in truth it is just dependent on the design and amount of input and output
filtering in the design of the amp. You can but simple Italian amps from RM
and these work 40 to 10 m and have minimal filtering and can putout a bunch
of garbage if overdriven. But the ameritron als 500 and 600, the mertron
1000, the henry 750 and others are all FCC approved. Elecraft is supposed to
be
building a 1kw and a legal limit solid state amp.
Now one of the best amps I ever used is the alpha 87 a and it is clean too.
the key is to start with a good design, and then run the amp in its linear
area. tune it to peak then back it down just a tad, , less garbage, longer
finals life and the folks on the other end will never tell the little loss.
But if you have a dirty amp, please dust it before use...:)
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