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12L6GT

Beam pentode for 600 mA series-heater receivers, designed as a sensitive output tube capable of useful audio power from relatively low supply voltage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7AC
Socket code: IO
Base pins: 8
Nominal heater: 12.6 V / 600 mA

Description

Beam pentode for 600 mA series-heater receivers, providing high power sensitivity at low supply voltage.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7AC
Socket code: IO
Base pins: 8
Nominal heater voltage: 12.6 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7AC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Pin 1	—	NC	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN2Pin 2	—	H — Heater	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN3Pin 3	A	P — Plate (Anode)	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN4Pin 4	A	G2 — Screen Grid	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN5Pin 5	A	G1 — Control Grid	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN7Pin 7	—	H — Heater	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN8Pin 8	A	BP — Beam-Forming PlateGroup AC8	Verified 12L6GT/25L6GT manufacturer basing, 7AC
PIN8Pin 8	A	K — CathodeGroup AC8	Verified 12L6GT/25L6GT manufacturer basing, 7AC

Section ratings

1 physical section, each with unique specifications.

Section 1

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 28000 Ω
Transconductance: 0.008 S
Max plate voltage: 200 V
Max screen voltage: 125 V
Max plate dissipation: 10 W
Max screen dissipation: 1.25 W

Published ratings/characteristics promoted where semantically applicable.

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

Beam Power

Capacitance

Input capacitance
15 pF
Output capacitance
10 pF
Grid-to-plate capacitance
0.8 pF

Other

Plate voltage
200 V
ClassA
Screen voltage
125 V
ClassA
Cathode resistor
180 ohm
ClassA
Screen current
2.2 mA
ClassA
Load resistance
4000 ohm
ClassA
Power output
3.8 W
ClassA
Plate voltage
110 V
ClassA
Screen voltage
110 V
ClassA
Grid voltage
-7.5 V
ClassA
Plate current
49 mA
ClassA
Screen current
4 mA
ClassA
Load resistance
2000 ohm
ClassA;PlateVoltage=110V
Power output
2.1 W
ClassA;PlateVoltage=110V

Characteristic

Plate resistance
13000 ohm
ClassA;PlateVoltage=110V
Transconductance
8000 uS
ClassA;PlateVoltage=110V

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
12.6 V
Nominal

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Grid-to-plate capacitance
0.8 pF
Input capacitance
15 pF
Output capacitance
9 pF

Other

Plate voltage
200 V
ClassA

Characteristics

Transconductance
9500 uS
ClassA
Plate resistance
30000 Ohm
ClassA

Data set 04

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate voltage
200 V
ClassA
Grid #2 voltage
125 V
ClassA
Cathode-bias resistor
180 ohm
ClassA
Zero-signal plate current
46 mA
ClassA
Maximum-signal plate current
48 mA
ClassA
Zero-signal grid #2 current
2.2 mA
ClassA
Maximum-signal grid #2 current
8.5 mA
ClassA
Load resistance
4000 ohm
ClassA
Total harmonic distortion
10 %
ClassA
Power output
3.8 W
ClassA
Heater warm-up time
11 s

Characteristic

Plate resistance
25000 ohm
ClassA
Transconductance
8000 uS
ClassA