At your own risk. Take all safety precautions.
A small box can contain the electron tube head amplifier.
A battery supplies the heater.
Then a centre tap from the secondary of the output transformer furnishes 48V to the circuit which can be used for anode supply.
With such a high anode supply Pleiades bias would not be required. One could connect a very high Megohm resistor from grid to cathode. Cathode is positive since it has lost electrons to the space charge. So in this way it may still be called Pleiades bias. A very high Megohm resistor should be possible and the circuit is exactly the same as the Neumann U47. An output transformer that can stand DC can be directly connected to the anode.
If a UCC85 electron tube is used then possibly the heaters too can be powered by phantom. See other euroelectron posts.
But why should one should use a mixing console on 2018? Well,they may be useful.
But it must not be forgotten that the Motown masterpieces had the rhythm section mixed in the studio, not the control room by a made up electron tube adding amplifier with a speaker so that musicians could also listen while playing. The DI output was sent to the control room. See documentary on Motown, interviews and relevant euroelectron posts.
If needed an electron tube can be powered by just 4V including heaters and anode. See Pleiades V6 head amp.
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