Most folks like what 6V6's do in the 22-25ma range. Running them at a higher current draw is hotter and does lower the plate voltage. Would I run a tube way hot just to get plate voltage down? I doubt it. would I take note of plate voltage on a DR with the current draw set where I want it. Yes. Will a JJ handle what a DR has to throw at it? yes. Do other current manufacture
6V6's have the ability to handle those voltages? I don't know because I never took the chance. Before JJ's, I would run NOS or 6L6's in DR's to insure that the tube would work at the voltages that DR's develop. Post JJ's, no worry. What tubes are you running?