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Similar Tubes (Not Drop-In Compatible)
416B
Earlier version in the 416 series — same disc-seal construction but lower ratings
416C
Direct predecessor with same physical format but lower performance specifications
Electrical Specifications
Absolute Maximum
Anode Voltage (max)Max. Plate Voltage400V
Anode Dissipation (max)Max. Plate Dissipation12W
Typical Operating
Anode Voltage (typical)Plate Voltage (typical)250V
Anode CurrentPlate Current50mA
Notes
Disc-seal (lighthouse) construction with planar electrode geometry minimizes lead inductance for SHF/EHF operation.
Gold-plated body provides low-loss RF grounding contact. Early versions used glass spacers; later production switched to beryllium oxide (BeO) ceramic for better thermal conductivity.
Anode connection via top pin; grid via threaded ring on the body; cathode and heater via the four-pin base.
Requires a coaxial cavity or waveguide mounting structure for microwave operation — not usable in conventional sockets.
Handle with care: BeO ceramic is hazardous if fractured or ground to dust. Do not break or machine the ceramic spacers.
Predecessor tube 416C; the 416D is a selected version with tighter parameter tolerances for higher-frequency operation.