You ask Bob Pleka to sell you cooler running tubes, tell him you want #34s or there abouts.Where did you get the #34, How did you determine the bias range?
The bias of this amp is roughly, 400VDC with a 270 ohm bias resistor. From what Phil told me the number 65 to 80ma seems too stick. This is so far over tube spec it ain't even funny. I changed my bias resistors to a 330 ohm value to save the tubes a bit...the amp still sounds great but probably saves the tubes.