Heater wiring for twin rectifiers

[Greg.]

When wiring the heaters of twin rectifiers such as the pair of 5U4’s used in WAD 6550 and KeL34, is there any noise reduction benefit in wiring the heaters out of phase?

Many thanks in anticipation

[John Caswell]

Hi Greg,
Whilst there is some evidence this helps when used in output stages, be it PP or SE I cannot see it making any real difference on power supplies. I suppose the best I can answer is it's good practice to make the heaters the same.

John

[Greg.]

Many thanks, John. It was just a thought based on my experience with output valves.