117Z4 Vacuum Tube – Half-Wave Rectifier for Transformerless AC/DC Radios

The 117Z4 is a half-wave rectifier built to run directly off a 117V AC/DC line without a power transformer, part of the same family as the 117Z3 and 117Z6.

• Tube type: Half-wave rectifier
• Heater: 117V AC/DC, no transformer required
• Typical use: Rectifier stage in transformerless AC/DC radio power supplies

Common service-replacement tube for vintage AC/DC radio power supplies.