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I would locate the resistor right after the 6X5, that way you keep the voltage on the filters to a minimum. The max DC current for the 6X5 is 75mA, so (325-175)/.075= 2000, and 11.5 watts, as a worst case.
At 5000 ohms, 150/5000=30mA, and 4.5 watts. I would try the 5K ohm 5 watt resistor. Bring it up on a variac and monitor the voltage, and adjust the resistor value and wattage as required.
As for the filaments, try to keep the current rating and the actual load close to each other. Paralleling the outputs when you don't need to will make the filament voltage run on the high side. You may have to add up all the tube load currents by hand to determine your actual requirement if Sams does not give it.
Good luck.
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John Folsom
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