If you want real power with the 300B tube there are a few alternatives but they are crazy $$$ both in terms of the gear and tube cost. For example Canary makes a pair of pushpull 300B monoblocks using 4 300Bs per block. Right there to retube those amps with any decent sounding 300B your looking at $3K or more just for the tubes. As pointed out above there are other avenues to explore and other triodes. Congrats on your new amp!
Is there a 300B type amp out there with some WATTS behind it?
I recently acquired a Feliks Audio Arioso 300B amp. To put it simply, it is incredible. I understand one way to tackle the issue of using SET amps is with high sensitivity speakers. Is there a 300B or something that gives you that same sound out there with power so you have more speaker options?