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← DIY WorkshopDIY PROJECT 03 / POWER
Tube PSUVariable Power Supply
A flexible three-rail power foundation for tube circuits, one-off experiments and future builds.
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A classic circuit.
A builder-first approach.
The HoneyBadger variable tube supply combines the rails commonly needed in valve projects on one practical PCB: a high-current heater supply, an adjustable high-voltage plate rail and an optional utility rail for relays, LEDs or supporting circuitry. It is a useful starting point when the audio circuit is exciting but the power supply should simply work.
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Heater current
A dedicated low-voltage heater rail supports demanding valve complements with up to 4 A available when correctly configured.
Variable high voltage
The adjustable plate supply provides a practical high-voltage rail for a wide range of tube preamp, compressor and experiment circuits.
One useful extra
An optional third rail can power relays, indicator LEDs or other accessories without adding another supply board to the chassis.
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