Don't forget that you need -to calculate the plate dissipation- to take in account the actual PLATE voltage, ie between plate and cathode (not plate to ground or B+ to ground or B+ to cathode), and subtract the screen current.
I use 6P3S in a VHT SP6 with a 235 ohms cathode resistor, and it leads to a 19-20 watts of plate dissipation under a B+ of 343 volts (6P3S are given for 20,5 watts)
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Edit : well Tubeswell just explained
I use 6P3S in a VHT SP6 with a 235 ohms cathode resistor, and it leads to a 19-20 watts of plate dissipation under a B+ of 343 volts (6P3S are given for 20,5 watts)
Edit : well Tubeswell just explained
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