Something like this then. Thanks.
Yes that second one down is it. Connect your last filter cap to the negative rail, ground it there, and then on to the tube heaters
Depending on your transformer specs and losses, you may need a cap right after the bridge too.
Of course, if you have about 1V spare after the balanced filter, then one step up from that scheme above would be to use a cap multiplier in lieu of the last series R and shunt C.
You'll loose about .7V on the base to emitter drop, and a little across the feed resistor due to the transistor's base current, but it will afford you the ability to use a bigger time constant and it'll really go a long way to getting rid of ripple.
However, even if you divide up what is usually shown as a single RC filter in heater supplies into two filters with half the resistance and twice the capacitance per, it'll work better than one single filter.