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6L6GC

High-rating 6L6-family beam-power audio tube with approximately 30 W plate dissipation and 500 V capability for powerful hi-fi and musical-instrument output stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7AC
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 900 mA

Description

High-power 6L6-family output tube intended for audio-frequency power amplification.

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: 6.3 V
Nominal heater current: 900 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: 22500 Ω
Transconductance: 0.006 S
Max plate voltage: 500 V
Max screen voltage: 450 V
Max plate dissipation: 30 W
Max screen dissipation: 5 W
Max cathode current: 150 mA

Section values promoted from published characteristics and maximum ratings.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
900 mA
Plate voltage
450500 V
Typical operating conditions
Plate current
40 mA
Typical operating conditions

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Plate resistance
33000 ohm
PromotedValue
Transconductance
0.0047 A/V
PromotedValue
6.3 VOLTS — published value 1
6.3 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.
6.3 VOLTS — published value 2
0.9 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.
HEATER VOLTAGE — published value 1
6.3 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.
HEATER VOLTAGE — published value 2
6.3 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

Other

Maximum plate voltage
500 V
PromotedValue
Maximum screen voltage
450 V
PromotedValue
Maximum plate dissipation
30 W
PromotedValue
Maximum screen dissipation
5 W
PromotedValue
Maximum cathode current
210 mA
PromotedValue
MAXIMUM PLATE VOLTAGE — published value 1
450 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.
MAXIMUM PLATE VOLTAGE — published value 2
500 VOLTS
OCR table transcription; verify against supplied datasheet layout where multiple columns represent operating conditions.

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum Plate Voltage
500 V
Maximum Screen Voltage
450 V
Maximum Plate Dissipation
30 W
Maximum Screen Dissipation
5 W

Characteristic

Plate Resistance
22500 ohm
Transconductance
6000 uS

Data set 04

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage ….………sceerraeererereencenençennenensnannnnnnee VÊ
6.3 V
Heater current …… … If
900 mA
Capacitance grille n° 1/ anode
0.6 pF
Capacitance d'entrée …… se
10 pF
sous sove 00
6.5 pF
ce secsanecemesssrensecccemes | VA
500 V
Screen-grid voltage (1) Ve,
450 V
Screen-grid dissipation …. … Peg
5 W
Tension entre filament et cathode …..….….….….……eorewre | VfK
200 V
Tension' d'ANOdE .….……ersesrsesrevorcesss cec V3 250 300
300 V
Screen-grid voltage , . Ve, 250 200
250 V
Tension de grille n° 1 … . Vg, -14 | -12,5
-18 V
Tension d'entrée AF., valeur de cretp Vecr 14 12,5
18 V

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage nominal
6.3 V
Heater current
900 mA
Voltage (AC or DC)
6.3 %
Published source row
Voltage (AC or DC) (value 2)
10 %
Published source row
Current at
6.3 V
Published source row
Current at (value 2)
0.9 V
Published source row

Capacitance

grid No
2 pF
Published source row
grid No (value 2)
10 pF
Published source row
grid No
2
Published source row
grid No (value 2)
6.5
Published source row

Characteristics

Plate Voltage
250 V
Published source row
Grid-No
2 V
Published source row
Grid-No (value 2)
250 V
Published source row

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater Voltage
6.3 V
Nominal
Heater Current
900 mA
Nominal
Peak Heater-Cathode Voltage
200 V
Plate Voltage
250 V
ClassA;PlateVoltage=250V
Screen Voltage
250 V
ClassA;PlateVoltage=250V
Control Grid Voltage
-14 V
ClassA;PlateVoltage=250V
Zero-Signal Plate Current
72 mA
ClassA;PlateVoltage=250V
Zero-Signal Screen Current
5 mA
ClassA;PlateVoltage=250V

Capacitance

Grid No.1-to-Plate Capacitance
0.6 pF
Grid No.1 Input Capacitance
10 pF
Plate Output Capacitance
6.5 pF

Characteristic

Plate Resistance
22500 ohm
ClassA;PlateVoltage=250V
Transconductance
6000 uS
ClassA;PlateVoltage=250V

Data set 07

199X JJ

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Typical Plate Voltage
250 V
Typical Screen Voltage
250 V
TypicalControlGridVoltage
-14 V
Typical Plate Current
72 mA
Typical Screen Current
5 mA
LoadResistanceSingle
22500 ohm
ClassA1;OneTube
PowerOutputSingle
6.5 W
ClassA1;OneTube
PlateToPlateLoadResistance
5000 ohm
PushPull;ClassA1;TwoTubes
PowerOutputPushPull
17.5 W
PushPull;ClassA1;TwoTubes

Characteristic

GridCapacitance
12.5 pF
Plate Capacitance
10 pF
PlateGridCapacitance
1.5 pF

Data set 08

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater Voltage (AC or DC) 5.7 6.3
6.9 V
SourcePage1-2
Heater Current @
6.3 V
SourcePage1-2
Cathode-to-heater potential ±
200 V
SourcePage1-2
Grid no. 1 to plate
0.6 pF
SourcePage1-2
Grid no. 1 to cathode, heater, grid no. 2, and beam forming plates
10 pF
SourcePage1-2
Plate to cathode, heater, grid no. 2, and beam forming plates
6.5 pF
SourcePage1-2

Other

DC plate voltage VP
500 V
SourcePage1-2
Screen grid voltage Vg2
500 V
SourcePage1-2
Plate Dissipation
30 W
SourcePage1-2
Screen Grid Dissipation
5 W
SourcePage1-2
DC plate voltage 350
250 V
TypicalOperation
Screen grid voltage
250 V
TypicalOperation
Control grid bias voltage -18
-20 V
TypicalOperation
Peak AF grid voltage 18
20 V
TypicalOperation

Data set 09

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Uf
6.3 V
Published value
If
900 mA
Published value
Ua
250
Published value
Ug2
250
Published value
Ug1
-14
Published value
Ia
72
Published value
Ra
22.5
Published value
N
6.5
Published value
Triode Pentode cg1
12.5 pF
Published value
Ua
450
Published value
Ug2
450
Published value
Wa
30
Published value