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BATTERY for filament heating

I'm planning to use batteries in the cathode to heat the filaments of a 2A3 (driver) and an 845 (output).
Is that not recommended in your experience ?

I suppose I'll use 2 NiCd's =2.4V for the 2A3 and lead acid batteries for the 845. Not quite sure about the latter yet. I would need 5 cells for 5x2 = 10V. Can't quite get there with NiCd's as 8x1.2=9.6V.
The idea is to avoid almost anything (i.e. resistors, caps) between the filament and the ground.

Should I use an equal number of cells on each side of the filament or should I put them all on one side ? i.e.

/\
| |
= =
| |

or

/\
| |
| =
| |


?

(hope this comes out ok..)

This is all for RC coupling between stages with fixed bias say.
If I go for direct coupling it will get more complicated. One idea would then be to use gas regulators (stacked for the 845) to achieve cathode bias. (Again then I wonder if I should use one on each leg or not.)

It all sounds crazy - that's why I haven't done it yet..

Stelios

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