I like to draw schematics, i have few 6028 tubes so why not
It's proposition of u47/48 based circuit for different microphones bodies, not u47 clone.
Different tube, different transformer, different headbasket (size, mesh), chinese capsule so it wouldn't be U47 anyway.
Only making a good microphone based on a good circuit
In general a cheap build.
To use the circuit in a small body, the best way is to use small output transformer and direct heating from 20V PSU, to remove 1,8k "warmer".
First i had in plan to build it in blue baby bottle style body, but right now i think about MXL 770.
Transformer which i want to try is 1:7 Sennheiser.
Since 6028/408a tubes are small it can fit many bodies.
Schematic updated, 3P3T switch topology was mistake.
Right now is DP3T, removed one 100M resistor and additional filtering 10nF capacitor for figure of eight pattern.
Since plate/polarisation voltage isn't common with filament, most of filtering can be done in PSU.
Right now am thinking about new switching schematic for MXL770 body. Since there are two cutouts for switches, maybe i will use two switches for polar pattern change
Then it can use additional filtering inside microphone.
We will see.