0A2 Voltage Regulator Tube – Cold-Cathode Gas Regulator (150V)

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The 0A2 is a cold-cathode, gas-filled voltage regulator tube — it ionizes rather than using a heated filament, holding a steady 150V reference across a power supply's B+ line. Tube type: Cold-cathode gas voltage regulator Base: 7-pin miniature Heater: None (cold-cathode, gas-ionization type) Typical use: Voltage reference/regulation in vintage radio, instrument, and amplifier power supplies Part of the 0-series cold-cathode regulator family alongside 0B2, 0C3, and 0D3. Show more