The C1 does need a bit more juice to do well especially in a bigger room. I have yet to hear it from a tube amplifier but I have seen it did very well even from smaller SS amps like Naim.
These days there are many integrated amps available. You may want to consider SS amps to get the most juice out of a smaller package. One good one I can think off that will march well is the Passlab INT-60 or 150.
Cheers!
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