Doing the math by the numbers you have there,I get 55ma's across that 600 ohm resistor.Now if you are measuring your plate volts to ground you have 22 watts,or if you subtract your cathode volts you get 21watts.I think maybe your GE tubes that fried had a short or some serious leakage before you put them in the amp and that is why they sizzled.I would try a fresh set of tubes and see what numbers you come up with.That 600ohm cathode resistor should run a good pair of 6V6 tubes in a much safer,if not somewhat coldish range.

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