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4DT6 Vacuum Tube New and Used

- Description
- Specifications
The 4DT6 is a 7-pin miniature sharp-cutoff dual-control pentode designed for FM detector, sound limiter, and audio driver stages in radio and television receivers. Operating on a 4.2V/450mA series heater, its dual control grids allow efficient FM quadrature detection with high AM rejection. It was widely featured in mid-century Zenith, RCA Victor, and Admiral FM/AM receivers and TV audio circuits. Available in NOS and tested used conditions.
Type: Sharp-Cutoff Dual-Control Pentode (FM Detector / Limiter)
Base: 7-Pin Miniature (EIA 7EM layout)
Heater Voltage: 4.2V
Heater Current: 0.45A
Max Plate Voltage: 300V
Max Screen Grid Voltage: 100V
Max Plate Dissipation: 1.5W
Transconductance (Grid 1 to Plate): 3,100 microsiemens (3.1 mA/V)
Equivalents: 4DT6, 3DT6 (3.15V equivalent), 6DT6 / 6DT6A (6.3V equivalent), 12DT6 (12.6V equivalent)