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3B401J

Double-disc-seal UHF power triode for high-frequency transmitting service. Low-inductance electrode connections, approximately 40 W plate dissipation, and kilovolt plate capability suit compact RF power stages where conventional lead structures become limiting.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 2 A

Description

Double-disc-seal UHF power triode.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 2 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2000 Ω
Amplification factor: 6
Max plate voltage: 1000 V
Max plate dissipation: 40 W
Max cathode current: 100 mA

Published triode ratings/characteristics promoted from the approved datasheet.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Anode-grid capacitance
4 pF
Direct inter-electrode capacitance
Anode-filament capacitance
0.2 pF
Direct inter-electrode capacitance
Grid-filament capacitance
5 pF
Direct inter-electrode capacitance