The schematic for the amp using the cap divider to power the tube heater

The as built schematic except one resistor. I put a 470 Ohm resistor in series with the diode to avoid inrush on power up.

I ran the sim to see how it would compare to the actual circuit. 

A tip of the hat to the DIT. A very useful circuit indeed.
One caution if you try it.
BE CAREFUL ABOUT THE NEUTRAL ON THE POWER LINE.
Use a polarized plug and be sure not to ground the hot line.