At your own risk.
There may be issue with the polarity of the electrolytic inside devices. Needs investigation.
It should work with JFET or transistor prepreamps too.
This idea is using the 11KΩ input resistor of the Marantz CP430 or PMD430 or any other equipment that has an internal resistor across its input with their usual capacitor. Most equipment should have both.
The Pleiades V4 only has an EF183 electron tube triode connected, a 3.9ΜΩ biasing resistor from anode to grid, an input capacitor to grid, an anode resistor, an anode capacitor and a 3.7 volt battery.
The last resistor and capacitor should be possible to be omitted by using the ones inside the Marantz or other recorders.
The output connector can be replaced by an insulated type. The positive battery terminal,through fuse of course can be connected to the unbalanced out screen or shield. So electrons flow through the Marantz 11KΩ input resistor from the electron tube anode. The Marantz internal capacitor takes the signal and stops the DC component.
It should work.
It cannot be overemphasized how careful we must be when working with batteries. And fuses ready to cut the circuit should be installed next to any battery terminal used.
So one could use a studio quality microphone such as the Beyer M55. Speaking or singing to it at even the quitest detailed voice. Getting a very high signal to noise ratio from the EF183 to drive hotly the Marantz and get much of the juice from its discrete transistor input stage.
At quiet indoor or outdoor environments, recordings of exceptional signal to noise ratio and quality should be possible.
The above idea should be suitable too for connecting electret condenser mics directly to the Marantz or other recorders by using an external properly fused battery.
The potentials of the 2 devices connected may be different so caution should be exercised to not letting them touch.
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