It won't be easy.
If something truly portable is to be made...
An omnidirectional microphine such as Beyer M55 or Sony F-96 could be used.
Inside the mic could be the stepping up transformer producing correct frequency responce from artist's brain to listener's brain.
Then a JFET preamplifier stage(s).
Then an interstage transformer made from a very thin magnetic material (small cross sectional area so it can easily saturate while producing the rising 6dB per octave recording characteristic slope).
The secondary of the interstage transformer feeding a few JFET stages. Then frequency selective negative feedback (for example with a capacitor resistor circuit) from the last stage to the first to low cut at 6dB per octave to restore the frequency response to flat while rounding limited peaks. This should hopefully give a nice simulation of very fast running reel to reel tape recording in real time.
Metallurgy seems very important for the transformer ring core.
If all these can fit inside the mic including a buffer JFET stage, then everything can be directly connected to an iPad or mobile phone mic input. Could the mic input power not only the buffer stage but everything else?
Would this be a great solution for an artist wanting to have top natural, loud and alive studio quality by just connecting a mic to a device?
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