A very low noise battery powered electron tube microphone booster preamplifier with no capacitors

At your risk. please take all safety precausions. It should be possible with just 1 direct filament double triode DCC90 (3A5) and just 2 signal transformers, like a langenvin circuit. The electron tubes can be operated with grids at space potential which should be even more low noise. So mic connected to input transformer primary, secondary connected to each control grid. Anodes connected to output transformer primary, center tap connected to Vb or (phantom power 48V which may be too much...). Secondary of output transformer is mic out, center tap could be used to get the phantom power voltage. 2 AAA etc 1.2V batteries in series with fuse and switch to supply firect filament cathodes. This circuit has not been built yet so the negative of va (filament supply) possibly connected to negative of Vb and to chassis. XLR pin 1 connected to its nearby chassis terminal too. If phantom power is not used vb can be made from a few 4LR44 connected in series each pair making roughly one AA battery 9see previous posts). The circuit may even barely operate withy 12v, better with 24V, 36V may start being too much as grids are at space potential and there would be field penetration to grids from the positive anode. This kind of circuit has alreadyt being tried a long time ago with an ECC82 (12AU7) both heater and anodes (plates) supplied with 12V through a protective fuse. It worked but it was very sensitive to light as photons apparently created photoemmision and changed the potential of the grids?. If memery is correct gain would increase with brighter light! The DCC90 would consume much less enery per unit time.