Hey guys, I'm looking for some suggestions on power tubes for my Tone King Comet 40A. It uses 4-6V6's. I'm not sure how high the plate voltages run on this amp, therefore I'm unsure what tubes I can really get away with these days. It currently has JJ 6V6 S' in it. It would be nice to have some softer, less "in the face" sounding tubes. Ideas? TIA!