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3B40IJ

Double-disc-seal UHF transmitting triode of the 3B401J family. Its low-inductance construction, approximately 40 W plate dissipation, and kilovolt plate rating are optimized for high-frequency RF power operation.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Double-disc-seal UHF transmitting triode, equivalent to 3B/40IJ.

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

Double-disc-seal UHF triode.

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

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Peak emission
750 mA
Plate resistance
2000 ohm
At Va 800 V, Ia 40 mA

Capacitance

Anode-grid capacitance
4 pF
Anode-filament capacitance
0.2 pF
Grid-filament capacitance
5 pF

Other

Maximum anode current
100 mA
Maximum grid current
15 mA