1L4

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Tube amp rating 50mA filament current; base miniature 7-pin (B7G) glass envelope layout; sharp-cutoff vacuum tube pentode engineered for low-power RF or IF amplification in vintage portable battery-operated receivers; voltage 1.4 Volts filament / 90 Volts plate maximum. Equivalents: RCA 1L4, Sylvania 1L4, DF92. Real-Life Examples: Post-war portable tube radios, vintage military field transceivers, and classic shortwave regenerative test receivers. Show more