1LA4

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Tube amp rating 50mA filament current; base miniature 7-pin (B7G) glass envelope layout; high-mu power amplification vacuum tube pentode engineered as a low-voltage audio output dr iver for battery-powered consumer electronics; voltage 1.4 Volts filament / 90 Volts plate maximum. Equivalents: Sylvania 1LA4, Philco 1LA4, DL91. Real-Life Examples: 1940s personal portable radios, vintage tabletop battery-powered receivers, and early diagnostic telemetry monitoring equipment. Show more