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2. single low voltage supply. 9 volt battery would be great.
(with bipolar op amp supplies, one often ends up with too many darn components. and yes i know bout the 5 buckie mic pre.)
4. maybe useing a low voltage cheap "new technology tube" or a couple of germanium transistors

Sadly, 2 and 4 don't mix. A 9 volt battery isn't going to reliably give the 100volt+ HV that the anode requires of a vacuum tube, and supply the heater current. Germanium transistors? I would have thought that at the very least, a low noise analog op-amp with feedback set for the right gain would have been a much more effective option. But just my 2 cents.

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