At your risk. Take all safety precautions when working with any voltage, current.
This is the datasheet:
https://frank.pocnet.net/sheets/185/5/5842.pdf
Plate (internal output) impedance can be of the order of 2KΩ.
How would it sound with an impedance matching transformer feeding a linoleum Pleiades fullrange speaker? For example the linoleum Pleiades Auratone 5C type or a linoleum Pleiades triangular pyramid speaker?
Would it also operate at say 50V with Pleiades bias with a very high megohm resistor from anode to grid, cathode grounded? Or cathode grounded, open grid?
Since it has relatively high μ (amplification factor), would it work without an input transformer?
This can also be seen from the anode current vs anode voltage curves with grid voltage as a parameter. Small excursions of grid voltage are needed for full output swing.
The idea behind using this electron tube is creating an impedance match amp for maximum power transfer, operating in class A (electrons flowing all the time). Even at 2W plate dissipation, ie 1W max output it should sound very loud, big, deep bass with an output transformer of adequate primary inductance.
A similar argument should apply to the use of an E88CC (2.6KΩ plate resistance) as a 2 channel power amplifier. Grid excursion voltage needed is greater.
https://frank.pocnet.net/sheets/190/e/E88CC.pdf
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