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I need the most simple tube preamp that can run on low voltage. Does somebody know such circuit? Oh yeah no controls needed

Why low voltage? To use for what?

For really small battery amp, that i'm building.

Even if you use submini tubes the heating and all that would use way too much current, yes- even at low voltages. You'd use up more batteries in one evening than the whole thing would cost. Well, maybe that's not the case, but you get my point
I'd look into a mosfet/jfet preamp instead of real tubes. Way less power consumption and easier to handle.

Haha that would be pretty expensive. I'm gonna look in the jfet and mosfet preamps. Tnx Schlatte