The microphone is connected to a recorder.
The microphone dry signal is also conected to a high quality amplifier connected to a speaker in the same room.
Omnidirectional microphones should work best.
Volume is adjusted well before positive feedback
It should work great for vocals, harmonicas etc.
The distance between loudspeaker and mic adjusts the pre delay as in a real echo chamber.
The acoustics and quietness of the room play important role.
And the room which is the echo chamber could be adjusted to taste with reflecting absorbing diffusing surfaces.
A full range speaker without cabinet should work best as was possibly done at the Columbia EMI studios in Athens.
Single ended low power amplifiers operating in class A (electrons flowing all the time), tube or transistor should shine. An example amplifier is the Pleiades amplifier operating with just a power transistor and a base bias resistor form collector to base. It is battery powered. Open source schematics at euroelectron blogspot.
How would it sound like recording a full band- orchestra in the room each sound source playing softly very closely to its mic and deciding by listening to the sound in the room? Deciding how much of each instrument to live amplify sending to the echo chamber which is the studio itself.
Possible mics may be Beyer M55 moving coil omnidirectionals all electrically connected in series- parallel combinations.
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