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Tube Tinker — Electron Tube Database
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Voltage - Triode (with diode, heptode or hexode) ·Heptode-Triode

ACTH1

Triode-heptode frequency changer for AC-operated all-wave superheterodyne receivers. The triode serves as local oscillator while the heptode performs mixing with minimized interaction between oscillator and signal circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
-
Base pins
-
Nominal heater
4 V / 1 A

Description

Triode-heptode frequency changer designed for A.C. mains all-wave receivers with low oscillator-to-input interaction.

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
4 V
Nominal heater current
1 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

2 physical sections, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances
Plate resistance
1600000 Ω
Transconductance
0.003 S
Max plate voltage
250 V
Max screen voltage
250 V

Heptode frequency-changer section.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.0053 S
Amplification factor
16
Max plate voltage
150 V
Max cathode current
15 mA

Oscillator triode section.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

  • Conversion conductance

    750 uA/V

  • Conversion conductance

    870 uA/V

    Alternate

Characteristics

  • Plate resistance

    1.6 MOhm

Capacitance

  • Working grid-earth capacitance hot

    12.2 pF

SECTION 2

Triode

Other

  • Typical anode voltage

    80 V

  • Typical anode current

    4 mA

Capacitance

  • Anode-earth capacitance

    4.9 pF

  • Grid-earth capacitance

    10.25 pF

  • Anode-grid capacitance

    2.25 pF