6M2

Dual-sensitivity cathode-ray tuning indicator producing a fluorescent Maltese-cross display for visual receiver tuning across differing control-voltage ranges.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: IO8
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 200 mA

Description

Dual-sensitivity cathode-ray tuning indicator producing a fluorescent Maltese-cross display.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: IO8
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

IO8 - 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 dissipation: 0.5 W

Representative indicator amplifier section; two sensitivity sections are present.

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
Maximum Heater Cathode Voltage
100 V
StrongSignalCutoffVoltage
-20 V
Section1
WeakSignalCutoffVoltage
-4 V
Section2
Target Current
0.3 mA
TypicalOperation