ACS2PEN

Mazda high-slope screened pentode for AC mains receivers. Manufacturer documentation supports frequency-changer, detector, and amplifier service, giving it broader functionality than a conventional RF pentode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: M7A
Base pins: 7
Nominal heater: 4 V / 1 A

Description

High-slope screened pentode for A.C. mains receivers, usable as a frequency changer, detector or amplifier.

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: 0.0058 S
Max plate voltage: 250 V
Max screen voltage: 150 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

Characteristics

Conversion conductance
1700 uA/V
FrequencyChanger

Other

Typical anode voltage
250 V
Typical screen voltage
120 V
Peak heterodyne voltage
3.5 V

Capacitance

Grid-earth capacitance
13.5 pF
Anode-earth capacitance
8.75 pF
Anode-grid capacitance
0.009 pF