• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Tube just for show...

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Orange and lit filament, but rectify some output to blue LEDs so that they glow blue with the volume peaks.

Or look up Roger Stephans glass sculptures and mount LEDs to light from below. Very phallic-looking yet female-form blowm glass, look kind of like tubes but solid glass. Stencil on a number starting with a 6 or 12 implying a filament voltage. Keep 'em wondering.
 
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