Oh - I just realized you said tubes on the LOW freq! That does not make sense to me. Put the tubes on the highs and keep the high-damping-factor SS amp for the lows. Much more logical that way.
I do it and love it. You have to be able to modify the gain on one of the amps so you can match their output levels. Power output doesn't factor in - only the input sensitivity does (gain will be fixed once set). If you can find two amps with the same sensitivity, you are in luck since you then won't need gain control. You also would need a preamp with two sets of outputs.
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