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Voltage Radio Detector Converter ·Pentode-Triode

ACTP

Triode-pentode self-oscillating frequency changer for AC-mains radio receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
M7A
Base pins
7
Nominal heater
4 V / 1.25 A

Description

Indirectly heated triode-pentode designed as a self-oscillating frequency changer; the two sections share a common cathode.

Socket description

British/European 7-pin

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
M7A
Base pins
7
Nominal heater voltage
4 V
Nominal heater current
1.25 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

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0034 S
Max plate voltage
250 V
Max screen voltage
250 V

Variable-mu pentode mixer section.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.0014 S
Amplification factor
30
Max plate voltage
200 V
Max cathode current
2 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

Pentode

Characteristics

  • Maximum conversion conductance

    900 uA/V

  • Plate resistance

    900000 Ohm

Other

  • Typical anode voltage

    250 V

  • Typical screen voltage

    200 V

  • Typical anode current

    6.5 mA

  • Typical screen current

    2.5 mA

Capacitance

  • Anode-earth capacitance

    8 pF

  • Grid-earth capacitance

    7.75 pF

SECTION 2

Triode

Other

  • Recommended anode voltage

    150 V

Capacitance

  • Anode-earth capacitance

    4 pF

  • Grid-earth capacitance

    5.25 pF

  • Anode-grid capacitance

    2.5 pF