At your own risk.
More details on the nearby euroelectron post.
The concept is:
Each grid supplied by signal through a capacitor.
The electrons on each tube freed by a high Megohm resistor from anode to grid masking operation possible at low anode voltage. This concept is used on most Pleiades pre and power amplifiers.
The cathodes connected to ground.
The anodes connected to an output transformer as usual.
The 24V by two 12V batteries in series supplying the heaters and also the anodes.
UL84 tubes can be tried with more batteries in series.
Extreme attention to safety should be exercised even with low voltages. The current can be extreme in case of a short circuit. Fuses should be used next to the battery poles. Rings, metal bracelets when working with such circuits are not allowed. Please use all safety precautions and common sense.
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