Any benefit to DC heater on parallel supply rectifier (GZ34)?

[leadbelly]

I know that there is no consensus on preference of AC or DC for tube heaters. However, for those that do use DC for their heaters, would the same hum elimination benefits apply to using DC for a parallel heater connected rectifier tube such as a GZ34? Or, if I am right in understanding the issue, would any induced ripple from the AC heater be common mode with the transformer secondary ripple and thus get taken care of with whatever filtering is already being performed in the power supply?

 

[EC8010]

No benefit at all.

 

[martinab2]

Heater supply will cross zero volts at the same time as the rectifier is switching. If anything, that should make an ac heater supply less noisy than dc. Cant see either option making the slightest bit of difference though.