4037A

High-mu ceramic-metal pencil triode for RF power amplification, oscillation, and frequency multiplication. Compact low-inductance construction and modest plate dissipation make it suitable for high-frequency circuits where conventional lead structures are limiting.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4
Base pins: 4
Nominal heater: 6.3 V / 145 mA

Description

High-mu ceramic-metal pencil triode for RF power amplifier, oscillator, and multiplier service.

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: 6.3 V
Nominal heater current: 145 mA
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

Transconductance: 0.0055 S
Amplification factor: 30
Max plate voltage: 360 V
Max plate dissipation: 6.25 W
Max grid dissipation: 1.5 W
Max cathode current: 25 mA
Rectifier peak inverse voltage: 1000 V
Rectifier nominal output current: 250 mA
Rectifier peak forward current: 800 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

Other

Nominal DC output voltage
300 V
HalfWave

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/filament voltage
4 V
Heater/filament current
2 A

Other

Maximum peak inverse voltage
1000 V
Maximum peak anode current
800 mA

Data set 03

1971 RCA HB3 Binder 6 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater/filament voltage
6.3 V
Heater/filament current
145 mA
Maximum plate voltage
360 V
Maximum plate dissipation
6.25 W
Typical pulsed plate voltage
1000 V
PulseRF
Useful power output
5 W
RF
Peak heater-cathode voltage
90 V
BothPolarities
Typical RF amplifier power output
5 W
CW

Characteristic

Amplification factor
30
Transconductance
5500 uS
Plate resistance
5454.545 ohm
DerivedFromPublishedMuAndGm