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12J5GT

General-purpose triode for resistance-coupled voltage amplification and oscillator service in radio and electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 60
Socket code: IO
Base pins: 8
Nominal heater: 12.6 V / 150 mA

Description

The Ken-Rad 12J5GT 1s a cathode type general purpose amplifier triode designed for use in resistance coupled smplifiers or in super-heterodyne circuits as an oscillator. The high mutual conductance and low output capacitence make the tube especlally suited for high frequency oscillator service. The 12J50T 1s a glass tube equipped with a small octel base. The electrical characteristics of this type are identicel to those of type 6J5GT except for heater requirements.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 60
Socket code: IO
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

60 - 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.0026 S
Amplification factor: 20
Max plate voltage: 300 V
Max plate dissipation: 2.5 W
Max cathode current: 20 mA

Source-defined physical/function section.

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

1937 Ken Rad

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
250 V
Plate Voltage 250 Volts Max.
Grid Voltage
-8 V
Grid Voltage -8 Volts
Plate Resistance
7700 ohm
Plate Resistance 7700 Ohms Approx.
Amplification Factor
20 ratio
Amplification Factor 20
Maximum Plate Dissipation
2.5 W
Maximum plate dissipation . + ¢« &« o ¢« o o ¢ o 6 ¢ ¢ ¢ o ¢ ¢ & 2.5 watts
Plate Voltage
90 V
Plate voltage., ., . . 90 volts
Grid Voltage
0 V
Grid voltage , ., . . . 0 volts

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
12.6 V
Heater current
150 mA

Capacitance

Grid-to-plate capacitance
3.8 pF