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6V6GT

Beam-power output tube designed primarily for audio amplification and also documented for triode-connected television vertical-deflection service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: RETMA 7AC
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 450 mA

Description

Power output tube intended for audio-frequency output-amplifier service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: RETMA 7AC
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

RETMA 7AC - 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

Beam Power

X-ray radiationInterelectrode capacitances

Plate resistance: 50000 Ω
Transconductance: 0.0041 S
Amplification factor: 9.6
Max plate voltage: 315 V
Max screen voltage: 285 V
Max plate dissipation: 12 W
Max screen dissipation: 2 W
Max cathode current: 105 mA

Promoted characteristics use the 250 V plate / 250 V screen Class A point; triode-connected values preserved as parameters.

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

1946 Amalgamated Wireless

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Heater or filament voltage
13 V
Published nominal rating
Grid-to-plate capacitance
0.7 pF
Direct interelectrode capacitance
Input capacitance
9.5 pF
Direct interelectrode capacitance
Output capacitance
7.5 pF
Direct interelectrode capacitance

Data set 02

1948 Brimar Radio Valve Manual

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA

Other

Power Output
4.5 W
ClassA

Data set 03

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA

Other

Power Output
4.5 W
ClassA
Power Output
14 W
PushPull;ClassAB

Data set 04

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate voltage
315 V
ClassA
Screen-grid voltage
225 V
ClassA
Grid voltage
-13 V
ClassA
Plate current
34 mA
ClassA
Screen-grid current
2.2 mA
ClassA
Load resistance
8500 ohm
ClassA
Power output
5.5 W
ClassA
Plate voltage
250 V
ClassA;PlateVoltage=250V
Screen-grid voltage
250 V
ClassA;PlateVoltage=250V
Grid voltage
-12.5 V
ClassA;PlateVoltage=250V
Plate current
45 mA
ClassA;PlateVoltage=250V
Screen-grid current
4.5 mA
ClassA;PlateVoltage=250V
Load resistance
5000 ohm
ClassA;PlateVoltage=250V
Power output
4.5 W
ClassA;PlateVoltage=250V
Plate voltage
180 V
ClassA;PlateVoltage=180V
Screen-grid voltage
180 V
ClassA;PlateVoltage=180V
Grid voltage
-8.5 V
ClassA;PlateVoltage=180V
Plate current
29 mA
ClassA;PlateVoltage=180V
Screen-grid current
3 mA
ClassA;PlateVoltage=180V
Load resistance
5500 ohm
ClassA;PlateVoltage=180V
Power output
2 W
ClassA;PlateVoltage=180V
Plate voltage
285 V
ClassAB;PushPull;TwoTubes
Screen-grid voltage
285 V
ClassAB;PushPull;TwoTubes
Grid voltage
-19 V
ClassAB;PushPull;TwoTubes
Zero-signal plate current
70 mA
ClassAB;PushPull;TwoTubes
Zero-signal screen current
4 mA
ClassAB;PushPull;TwoTubes
Plate-to-plate load resistance
8000 ohm
ClassAB;PushPull;TwoTubes
Power output
14 W
ClassAB;PushPull;TwoTubes
Plate voltage
250 V
ClassAB;PushPull;TwoTubes

Characteristic

Plate resistance
80000 ohm
ClassA;PlateVoltage=315V
Transconductance
3750 uS
ClassA;PlateVoltage=315V
Plate resistance
50000 ohm
ClassA;PlateVoltage=250V
Transconductance
4100 uS
ClassA;PlateVoltage=250V

Data set 05

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate Voltage
250 V
ClassA; OneTube
Screen Voltage
250 V
ClassA; OneTube
Plate Current
45 mA
ClassA; OneTube
Load Resistance
5000 ohm
ClassA; OneTube
Power Output
4.5 W
ClassA; OneTube

Data set 06

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Capacitance

Grid-to-plate capacitance
0.7 pF

Other

Plate voltage
250 V
ClassA
Plate voltage
250 V
ClassAB;PushPull;TwoTubes
Output power
10 W
ClassAB;PushPull;TwoTubes

Characteristics

Transconductance
3700 uS
ClassA
Triode amplification factor
9.8 ratio
TriodeConnection
Triode plate resistance
1960 Ohm
TriodeConnection

Data set 07

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate Voltage
250 V
ClassA
Screen Voltage
250 V
ClassA
Peak Positive Pulse Plate Voltage
1200 V
VerticalDeflection,TriodeConnection

Characteristic

Triode-Connection Amplification Factor
9.8
TriodeConnection
Triode-Connection Plate Resistance
1960 ohm
TriodeConnection
Triode-Connection Transconductance
5000 uS
TriodeConnection

Data set 08

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage ..….…..…........crerereccecrecnmemsrennns VÊ
6.3 V
Heater current ……c IË
450 mA
Tension d'Anod®@ ……….…...…...…..….…eccreeenernenmençnmennnes Vä
315 V
Tension de grille n°2 ... … Ve,
285 V
Plate dissipation (1).. … Pa
12 W
Screen-grid dissipation ..........…...…...…crerrcreereerreeneeennces PB5
2 W
TEnsion d'ANOd@E …..……...…......…….…eeusecreenrensersencacreinesesenses V
250 V
Tension de grille n°2.. …… VE2
250 V
Tension de grille n°i ... … Veg;
-12.5 V
RÉsiStance interne ……n - p
52 kΩ
Transconductance ……n .S
41 mA/V
crr nerecr cec cu T
45 mA
Courant de grille n° 2 ….…...….…….wecrereeeeereeensennnnne 182
4.5 mA
Plate voltage …… …. Va 180 250
315 V
Tension de grille n°2 ... … Ve2 180 250
225 V
Tension de grille n° 1 (2). … Vg -8,5 12,5
-13 V
Tension de crête d'entrée crcc VECI 8,5 12,5
13 V
Plate current à signal nul …… Iasigo 29 45
34 mA
Plate current à signal max ………… Iasig max 30 47
35 mA
Courant de grille n°2 à signal nul … Ig sigo 3 4,5
2.2 mA
Courant de grille n°2 à signal max…. Ig, sig max 4 6,5
6 mA
Résistance de charge d'anode………… Ra 5,5 5
8.55 kΩ
Puissance de sortie …… PS 2 4,25
5.5 W
Plate voltage ...c V 250
285 V
Tension de grille n°2 …............….….…cererereresereeee VEA 250
285 V
Tension de grille n° 1 (1) …… V@ -15
-19 V
Tension d'entrée, de crête à crête …………….….….2Vecr 30
38 V
Plate current à signal nul …… Iasigo 70
70 mA
Plate current à signal max …… Iasig max 79
92 mA
Courant de grille n°2 à signal nul…………………….…. Ig Sigo 5
4 mA

Characteristic

Capacitance grille n° 1/ anode … … Ce,/a
0.3 pF
InterelectrodeCapacitance
Capacitance grille n° 1/ cathode et grille n° 3 … Cg,/Ke;
10 pF
InterelectrodeCapacitance
Capacitance anode/ cathode et grille n° 3 …… Ca/kg;
11 pF
InterelectrodeCapacitance

Data set 09

2026 Genalex Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Plate Current
38 to 46 mA
Plate 250 V; screen 250 V; grid -12.5 V
Transconductance
3000 to 5200 µS
Plate 250 V; screen 250 V; grid -12.5 V

Other

Power Output
3.4 W
Plate 250 V; screen 250 V; load 5.0 kohm; ClassA;OneTube

Data set 10

2026 Mullard Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Heater current
460 to 530 mA
Published min/max range

Data set 11

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Power Output
4.5 W
ClassA;OneTube;Plate 250 V;Screen 250 V