117L7 Vacuum Tube – Rectifier-Pentode Combo for Transformerless AC/DC Radios

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The 117L7 combines a half-wave rectifier and a beam power pentode in one envelope, built to run directly off a 117V AC/DC line without a power transformer — a classic three-way por table radio and phonograph tube. 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 Also cataloged as 117L7/M7GT. Show more