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Voltage - Dual Triode (dissimilar) ·Triode-Triode

4HA7

Dissimilar Compactron double triode combining a high-mu section and a medium-mu section in one envelope, providing two substantially different voltage-amplifier characteristics for multifunction circuitry.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
12FQ
Socket code
B12C
Base pins
12
Nominal heater
4.2 V / 600 mA

Description

The 4HA7 is a Compactron containing a high-mu triode and a medium-mu triode.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
12FQ
Socket code
B12C
Base pins
12
Nominal heater voltage
4.2 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

12FQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
7700 Ω
Transconductance
0.0022 S
Amplification factor
17
Max plate voltage
330 V
Max plate dissipation
2.75 W
Max cathode current
20 mA

Section 1 values mapped from the section-specific maximum-ratings and average-characteristics columns.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
62500 Ω
Transconductance
0.0016 S
Amplification factor
100
Max plate voltage
330 V
Max plate dissipation
0.3 W

Section 2 values mapped from the section-specific maximum-ratings and average-characteristics columns.

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

Triode

Other

  • Plate Voltage

    250 V

  • Grid Voltage

    -8.5 V

  • Plate Current

    10.5 mA

Capacitance

  • Grid-Plate Capacitance

    1.4 pF

  • Input Capacitance

    1.9 pF

  • Output Capacitance

    1.9 pF

SECTION 2

Triode

Other

  • Plate Voltage

    250 V

  • Grid Voltage

    -2 V

  • Plate Current

    1.2 mA

Capacitance

  • Grid-Plate Capacitance

    1.5 pF

  • Input Capacitance

    1.7 pF

  • Output Capacitance

    1.8 pF