not a tube expert but mine liked-
"V1 is the most important tube. I would start with a Tung-Sol hand selected, low noise 12AX7. Then For V2 a Mullard hand selected, low noise, high gain. You can then run a Ruby or a Svetlana in V3. (Does not need to be balanced.) "
Ruby or Svets for power. they're good durable tubes. mine were 6550's but EL34's are the same.
that is for a warm classic JMP to Plexi sound w/ lots of sweet harmonic feedback even @ lower volumes (depending on how you run the pre & master knobs),not some Zakk Wylde modern buzzsaw BS .
lots of bad press on JJ EL34 as weak glass & darker sounding so take that as you may.