If you go and listen to the 11 meter band the lower portion of the 40 channels like channel 6 and 12 you will here tube amps and that PLATE MODULATION them boys are after. Ill bet if you listen long enough you will and understand what was just explained about the fact any amp can sound horrible when pounding the p!$$ out of them.
You will here a few clean ones then the knucklehead will come in with so much audio and he also driving the hell out of his amplifier to where it sounds like hes talking or humming with his lips to a piece of plastic wrap (cellophane) or talking through a musical Kazoo. thats what were saying about being clean and staying within the amplifiers limits and not cranking your power microphone and RF power wide open to get that last FEW WATTS.. The same applies for a solidstate transistor amplifier if you decide to you beat the p$$ out of it expect to and count on sounding like $h!+.