Alternatives & variations Download PDF datasheet

Voltage - Triple Triode ·Triode-Triode-Triode

12MN8

High-mu triple triode, 12.6-volt heater version of 6MN8, for television matrix-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 12.6 V / 450 mA

Description

High-mu triple triode; 12.6-volt heater version of 6MN8.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 12.6 V
Nominal heater current: 450 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

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 1 W
Max cathode current: 12 mA

Representative row for three identical high-mu triodes.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 1 W
Max cathode current: 12 mA

Physical triode row restored under current one-row-per-physical-section policy.

Section 3

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 62500 Ω
Transconductance: 0.0016 S
Amplification factor: 100
Max plate voltage: 330 V
Max plate dissipation: 1 W
Max cathode current: 12 mA

Physical triode row restored under current one-row-per-physical-section policy.

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

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
12.6 V
Heater current
450 mA
Plate voltage
250 V
ClassA;EachSection
Grid voltage
-2 V
ClassA;EachSection
Plate current
1.2 mA
ClassA;EachSection
Maximum plate voltage
330 V
EachSection
Plate dissipation
1 W
EachSection
Heater warm-up time
11 s
ControlledWarmup

Characteristic

Plate resistance
62500 ohm
EachSection
Transconductance
1600 uS
EachSection
Amplification factor
100
EachSection