4BA6

Miniature remote-cutoff pentode designed for high-gain RF or IF amplification. Its small size, low grid-plate capacitance, high transconductance, and variable-mu characteristic suit gain-controlled receiver stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CC
Socket code: B7G
Base pins: 7
Nominal heater: 4.2 V / 450 mA

Description

The 4BA6 is a miniature remote-cutoff pentode for high-gain radio-frequency or intermediate-frequency amplification. The family features small size, low grid-plate capacitance, and high transconductance.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CC
Socket code: B7G
Base pins: 7
Nominal heater voltage: 4.2 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CC - 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

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.0044 S
Max plate voltage: 300 V
Max plate dissipation: 3 W
Max screen dissipation: 0.6 W

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Screen Supply Voltage
300 V
Plate Voltage
100 V
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Screen Voltage
100 V
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Cathode Bias Resistance
68 ohm
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Voltage
250 V
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Screen Voltage
100 V
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Cathode Bias Resistance
68 ohm
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Heater Warmup Time
11 s

Characteristic

Plate Resistance
250000 ohm
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Transconductance
4300 uS
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Current
10.8 mA
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Screen Current
4.4 mA
ClassA; PlateVoltage=100V; ScreenVoltage=100V
Plate Resistance
1000000 ohm
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Transconductance
4400 uS
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Plate Current
11 mA
ClassA; PlateVoltage=250V; ScreenVoltage=100V
Screen Current
4.2 mA
ClassA; PlateVoltage=250V; ScreenVoltage=100V

Capacitance

Grid1ToPlateCapacitanceMaximum
0.0035 pF
WithExternalShield
Input Capacitance
5.5 pF
WithExternalShield
Output Capacitance
5.5 pF
WithExternalShield