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4043D

Improved directly heated power triode for Class B audio, modulator, and RF applications. Its grid was engineered to reduce grid emission and increase undistorted output while retaining the 4043 family's moderate-voltage power capability.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4
Base pins: 4
Nominal heater: 7.5 V / 1.2 A

Description

Directly heated triode for Class B audio/modulator and RF service. The C/D version has a grid designed to reduce grid emission and permit greater undistorted output.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4
Base pins: 4
Nominal heater voltage: 7.5 V
Nominal heater current: 1.2 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: 3500 Ω
Amplification factor: 8
Max plate voltage: 600 V
Max plate dissipation: 35 W
Max cathode current: 110 mA

Published ratings/characteristics promoted; remaining useful source values represented as parameters.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Grid-anode capacitance
13.3 pF
Anode-filament capacitance
4.8 pF
Grid-filament capacitance
7 pF

Other

Maximum direct anode current
110 mA
Maximum direct grid current
30 mA
Maximum frequency at full ratings
2 MHz
Maximum anode voltage at 10 MHz
500 V
Frequency=10MHz
Direct anode voltage
600 V
ClassB;AF;TwoTubes
Load resistance anode-to-anode
6000 ohm
ClassB;AF;TwoTubes
Maximum output
73 W
ClassB;AF;TwoTubes

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/filament voltage
7.5 V
Heater/filament current
1.2 A
Plate resistance
3500 ohm
Amplification factor
8

Other

Maximum direct anode voltage
600 V
Maximum anode dissipation
35 W
Maximum cathode/anode current
110 mA