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Voltage Pentode ·Pentode

ACSP1

Mazda screened pentode developed specifically for noise suppression and automatic-tuning control circuits in AC mains radio receivers.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
M7A
Base pins
7
Nominal heater
4 V / 1 A

Description

Screened pentode intended for noise suppression and automatic tuning circuits in A.C. mains receivers.

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 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0027 S
Max plate voltage
250 V
Max screen voltage
250 V

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

Capacitance

  • Grid-earth capacitance

    13 pF

  • Anode-earth capacitance

    0.75 pF

  • Anode-grid capacitance

    0.0035 pF

Other

  • Typical anode current

    4.9 mA

    NoiseSuppression

  • Typical screen current

    4 mA

    NoiseSuppression