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12W6GT

Beam-power tube designed primarily for audio output and also usable, when triode-connected, as a television vertical-deflection amplifier.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7AC
Socket code: IO
Base pins: 7
Nominal heater: 12.6 V / 300 mA

Description

Beam power tube used for audio output and, triode-connected, television vertical-deflection 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: 7
Nominal heater voltage: 12.6 V
Nominal heater current: 300 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
Amplification factor: 6.2
Max plate voltage: 330 V
Max screen voltage: 165 V
Max plate dissipation: 12 W
Max screen dissipation: 1.35 W
Max cathode current: 60 mA
Rectifier warm-up time: 11 s

Datasheet states identical to 6W6-GT except heater and heater-cathode ratings and refers to 6W6-GT for complete data; no external values inferred.

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

Other

Maximum plate voltage
300 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
200 V
ClassA
Screen voltage
125 V
ClassA
Plate current
46 mA
ClassA
Screen current
2.2 mA
ClassA
Load resistance
4000 ohm
ClassA
Power output
3.8 W
ClassA
Triode-connected plate voltage
225 V
TriodeConnection VerticalDeflection
Triode-connected control-grid bias
30 V
TriodeConnection VerticalDeflection
Triode-connected plate current
22 mA
TriodeConnection VerticalDeflection
Maximum positive pulse plate voltage
1200 V
VerticalDeflection
Maximum plate dissipation
7.5 W
VerticalDeflection
Maximum DC cathode current
40 mA
VerticalDeflection

Characteristic

Plate resistance
28000 ohm
Published handbook characteristic
Transconductance
8000 µS
Published handbook characteristic
Heater voltage
12.6 V
Published heater rating
Heater current
600 mA
Published heater rating
Triode-connected plate resistance
1600 ohm
TriodeConnection
Triode-connected transconductance
3800 µS
TriodeConnection
Triode-connected amplification factor
6.2
TriodeConnection

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater Current
600 mA
SeriesHeater

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

Peak positive plate voltage
1200 V

Characteristics

Plate voltage
225 V
Transconductance
3800 uS
Plate resistance
1600 Ohm

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

Peak positive pulse plate voltage
1500 V
VerticalDeflection
Peak cathode current
195 mA
VerticalDeflection
Typical plate voltage
200 V
ClassA
Typical screen voltage
125 V
ClassA
Power output
3.8 W
ClassA
Maximum plate voltage
330 V
PromotedValue
Maximum screen voltage
165 V
PromotedValue
Maximum plate dissipation
12 W
PromotedValue
Maximum screen dissipation
1.35 W
PromotedValue
Maximum cathode current
65 mA
PromotedValue

Characteristics

Triode amplification factor
6.2
ClassA
Triode plate resistance
1600 ohm
ClassA
Triode transconductance
3800 uS
ClassA
Plate resistance
13000 ohm
PromotedValue
Transconductance
0.008 A/V
PromotedValue

Capacitance

Grid-to-plate capacitance
0.5 pF
Input capacitance
11 pF
Output capacitance
7 pF

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Plate Resistance
13000 ohm
ClassA;Ep=110V
Plate Resistance Triode Connection
1600 ohm
TriodeConnection
Transconductance Triode Connection
3800 uS
TriodeConnection
Amplification Factor Triode Connection
6.2
TriodeConnection

Other

Plate Voltage
110 V
ClassA
Screen Voltage
110 V
ClassA
Power Output
2.1 W
ClassA
Heater Warm-up Time
11 s

Data set 06

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Maximum Plate Voltage
315 V
Inherited from explicitly referenced 6W6GT parent except heater data.
Maximum Screen Voltage
285 V
Inherited from explicitly referenced 6W6GT parent except heater data.
Plate Dissipation
10 W
Inherited from explicitly referenced 6W6GT parent except heater data.
Screen Dissipation
2.5 W
Inherited from explicitly referenced 6W6GT parent except heater data.
Peak Heater-Cathode Voltage, Heater Negative
300 V
Inherited from explicitly referenced 6W6GT parent except heater data.
Peak Heater-Cathode Voltage, Heater Positive
200 V
Inherited from explicitly referenced 6W6GT parent except heater data.

Characteristics

Transconductance
7500 µS
Inherited from explicitly referenced 6W6GT parent except heater data.

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater Warm-up Time (Average) —
11 s
Other
lvalue
200 V
Other
Plate Voltage
330 V
MaximumRating
Grid-No
2 V
MaximumRating;PublishedValue1
Grid-No
165 V
MaximumRating;PublishedValue2
Plate Dissipation
12 W
MaximumRating
Grid-No
2 W
MaximumRating;PublishedValue1
Grid-No
1.35 W
MaximumRating;PublishedValue2
Plate Supply Voltage
110 V
TypicalOperation;PublishedValue1
Plate Supply Voltage
200 V
TypicalOperation;PublishedValue2
Cathode-Bias Resistor —
180 ohm
TypicalOperation
Peak AF Grid-No.l Voltage
7.5 V
TypicalOperation;PublishedValue1
Peak AF Grid-No.l Voltage
8.5 V
TypicalOperation;PublishedValue2
Zero-Signal Plate Current
49 mA
TypicalOperation;PublishedValue1
Zero-Signal Plate Current
46 mA
TypicalOperation;PublishedValue2
Maximum-Signal Plate Current
50 mA
TypicalOperation;PublishedValue1
Maximum-Signal Plate Current
47 mA
TypicalOperation;PublishedValue2
Zero-Signal Grid-No
2 mA
TypicalOperation;PublishedValue1
Zero-Signal Grid-No
4 mA
TypicalOperation;PublishedValue2
Zero-Signal Grid-No
2.2 mA
TypicalOperation;PublishedValue3
Maximum-Signal Grid-No
2 mA
TypicalOperation;PublishedValue1
Maximum-Signal Grid-No
10 mA
TypicalOperation;PublishedValue2
Maximum-Signal Grid-No
8.5 mA
TypicalOperation;PublishedValue3
Plate Resistance (Approx.)
13000 ohm
TypicalOperation;PublishedValue1
Plate Resistance (Approx.)
28000 ohm
TypicalOperation;PublishedValue2
Transconductance
8000 uS
TypicalOperation;PublishedValue1
Transconductance
8000 uS
TypicalOperation;PublishedValue2
Load Resistance
2000 ohm
TypicalOperation;PublishedValue1
Load Resistance
4000 ohm
TypicalOperation;PublishedValue2
Total Harmonic Distortion (Approx.)
10 %
TypicalOperation;PublishedValue1
Total Harmonic Distortion (Approx.)
10 %
TypicalOperation;PublishedValue2

Capacitance

Grid No.l to Plate
0.8 pF
Capacitance
Grid No.l to Cathode. Heater, Grid No
2 pF
Capacitance;PublishedValue1
Grid No.l to Cathode. Heater, Grid No
3 pF
Capacitance;PublishedValue2
Grid No.l to Cathode. Heater, Grid No
15 pF
Capacitance;PublishedValue3
Plate to Cathode, Heater, Grid No
2 pF
Capacitance;PublishedValue1
Plate to Cathode, Heater, Grid No
3 pF
Capacitance;PublishedValue2
Plate to Cathode, Heater, Grid No
9 pF
Capacitance;PublishedValue3