heater current question

[wireball]

Hey guys, if I use one side of a 12a-7, and figure out
which of heater pins 4 or 5 operate in that section. Then, operate
that heater at 6.3v, how much current will it draw? .3A or .15 A?

[Enzo]

Current is the same throughout a series circuit. The .15A in the 12v arrangement doesn't change when you consider only half. All the 12v arrangement is is two 6v heaters in series, each drawing .15A - the SAME .15A flows through both. In parallel across 6v, EACH side draws its own .15A, whuch in parallel adds to .3A.

[wireball]

Enzo, hello! Thank you once again for your help, I know it's
a basic question. Though I have built many amps, I didn't know
the answer to that one. It's never mentioned in any of the
tube data, and I could not find it in any of the many books I have.

I posted this question about a year ago and received two conflicting
answers.

I guess that's the reason it's not mentioned in the tube data.
No sense in being redundant, silly me. :D