It would be nice to make something like this:
A battery powered electron tube microphone amplifier such as Pleiades V(6) or V(-1) with variable components so that optimum conditions to the listener's brain are quickly dialed in.
It may have a variable anode to grid electron accelerating resistor.
A variable cathode resistor for implementing more conventional circuits such as V(-1).
Octal bases for input and output transformers.
Variable load resistor.
(All variable resistor potentiometers when possible should be wire wound for less hiss noise).
Variable heater series resistor to find the best cathode temperature for more signal and less noise. A switch for completely disconnecting the heaters so that the sweet spot can be travelled.
A micro Ampere meter in series with the anode circuit to note what the sweet spot is.
Terminals for connecting a high impedance cathode to grid millivoltmeter etc.
The objective is experimenting with low anode potentials and various tubes such as EF183 triode connected, 12AU7, 6SN7 etc for getting the most information out of the delicate and rich microphone signal or other very low voltage signal sources.
More information on the Pleiades V series pre preamplifiers.
It is nice playing with electrons or nature itself.
References:
Operating features of the Audion - Edwin Armstrong
On preserving transconductance of electron tubes at anode potential as low as 3 volts - euroelectron blogspot
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