[Reece]

Yes, the way to go is with a non polarized capacitor. It drops the voltage without heat. Be sure of course that you're dropping the voltage for the filament string only, as the B+ supply wants full line voltage. For the record, if using a resistor to drop voltage, it's a good idea to go strong on the wattage rating, even double what the calculation would say, in order that the resistor run cooler. Those Dale resistors that are made for chassis mounting as a heat sink are a good choice when going that route. But I do like the cap method better. Good idea to stick a high value resistor, like 270K, across the dropping cap, to quickly discharge it when the set is turned off. It can be a half watt or so.