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Power - Beam (NOT sweep) ·BeamPower-Rectifier

M7GT

Beam-power output tube intended for audio-frequency power amplification, providing useful loudspeaker-driving output in receiving and general amplifier equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8A0
Socket code: IO
Base pins: 8
Nominal heater: 117 V / 90 mA

Description

Combines a half-wave rectifier and beam power amplifier in the same envelope for AC-DC service from a 117-volt line, including three-way portable receivers.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8A0
Socket code: IO
Base pins: 8
Nominal heater voltage: 117 V
Nominal heater current: 90 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8A0 - 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

Rectifier

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 350 V
Rectifier nominal output current: 75 mA
Rectifier peak forward current: 450 mA
Rectifier forward voltage drop: 16 V
Rectifier max heater-cathode voltage: 175 V

Half-wave rectifier section of 117L7/M7-GT.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 13000 Ω
Transconductance: 0.0053 S
Max plate voltage: 117 V
Max screen voltage: 117 V
Max plate dissipation: 6 W
Max screen dissipation: 1 W

Beam-power amplifier section of 117L7/M7-GT.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

DC output current
75 mA
HalfWave
Peak inverse voltage
350 V
HalfWave
RMS supply voltage
117 V
HalfWave
Peak current
450 mA
HalfWave

Characteristic

Tube voltage drop
16 V
At150mADC

SECTION 2

Beam Power

Other

Plate voltage
105 V
ClassA
Screen-grid voltage
105 V
ClassA
Grid voltage
-5.2 V
ClassA
Plate current
43 mA
ClassA
Screen-grid current
4 mA
ClassA
Load resistance
4000 ohm
ClassA
Power output
0.85 W
ClassA

Characteristic

Plate resistance
17000 ohm
ClassA
Transconductance
5300 uS
ClassA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Characteristic

Average Characteristics Nz Volts
90 mA
Limits Of Supplied Voltage N7£
12 V
Maximum Dc Heater-Cathode Voltage
175 V

Other

Peak Inverse Voltage
350 V
Steady-State Peak Plate Current
450 mA
Ef =
117 V
Einput =
117 V

SECTION 2

Beam Power

Other

Plate Diss{Pation
6 W
E¢ =
117 V
¢ =
117 V
= E., =
105 V
E Egjg =
3.67 V