0D3 / VR150 Voltage Regulator Tube – Cold-Cathode Gas Regulator (150V)

The 0D3 (VR150) is a cold-cathode, gas-filled voltage regulator tube that holds a steady 150V reference — the highest-voltage member of the octal regulator family.

• Tube type: Cold-cathode gas voltage regulator
• Base: Octal 8-pin
• Heater: None (cold-cathode, gas-ionization type)
• Typical use: Voltage reference/regulation in vintage radio, instrument, and amplifier power supplies

Also cataloged as VR150 — same regulation voltage as the miniature-base 0A2, but in an octal envelope.