ACME

Mazda AC/ME cathode-ray tuning indicator for AC-mains receivers, using a fluorescent target and control electrode for visible tuning indication.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: 7
Nominal heater: 4 V / 500 mA

Description

Mazda AC/ME is an indirectly heated cathode-ray tuning indicator using a fluorescent target and control electrode to provide a visual indication of tuning in A.C. mains receivers.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 7
Nominal heater voltage: 4 V
Nominal heater current: 500 mA
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

Tuning Indicator

X-ray radiationInterelectrode capacitances

Max plate voltage: 250 V

Fluorescent cathode-ray tuning indicator; target maximum voltage also 250 V.

Section 2

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Internal control/amplifier triode section; added during tuning-indicator physical-section reconciliation.

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

Tuning Indicator

Other

Maximum target voltage
250 V
HT supply voltage
250 V
Target current
1.5 mA
Anode current at zero grid voltage
0.24 mA
Grid voltage for zero-degree shadow angle
-22 V