117N7 Vacuum Tube – Rectifier-Pentode Combo for Transformerless AC/DC Radios

The 117N7 combines a half-wave rectifier diode and a beam power pentode in one envelope, built to run directly off a 117V AC/DC line without a power transformer.

• Tube type: Rectifier-pentode combination
• Heater: 117V AC/DC, no transformer required
• Typical use: Combined rectifier and audio output stage in transformerless AC/DC portable radios and record players

Electrically related to the 117L7 and 117P7 — common tubes in inexpensive 1950s phonograph players.