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5881

Beam-power pentode electrically related to the 6L6 family, designed for audio-frequency power amplification with documented single-ended and push-pull output operation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: T7AC
Socket code: IO
Base pins: 7
Nominal heater: 6.3 V / 900 mA

Description

Beam power pentode electrically equivalent to the 6L6/6L6G family, intended for audio-frequency power amplification and related beam-power service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: T7AC
Socket code: IO
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 900 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

T7AC - 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: 30000 Ω
Transconductance: 0.0061 S
Max plate voltage: 400 V
Max screen voltage: 400 V
Max plate dissipation: 23 W
Max screen dissipation: 3 W

Published ratings and characteristics promoted from the approved source.

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

1950 General Electric Transmitting Types

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
900 mA
Application
HighPowerAudioFrequencyAmplifier

Data set 02

195X General Electric Essential Characteristics

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
Control-grid voltage
-14 V
ClassA;OneTube
Plate current
75 mA
ClassA;OneTube
Screen current
4.3 mA
ClassA;OneTube
Load resistance
2500 Ω
ClassA;OneTube
Power output
6.7 W
ClassA;OneTube
Plate voltage
360 V
ClassAB;PushPull;TwoTubes
Screen voltage
270 V
ClassAB;PushPull;TwoTubes
Control-grid voltage
-22.5 V
ClassAB;PushPull;TwoTubes
Plate current
88 mA
ClassAB;PushPull;TwoTubes
Screen current
5 mA
ClassAB;PushPull;TwoTubes
Load resistance plate-to-plate
6600 Ω
ClassAB;PushPull;TwoTubes
Power output
26.5 W
ClassAB;PushPull;TwoTubes

Characteristic

Plate resistance
30000 Ω
ClassA
Transconductance
6100 µS
ClassA

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
900 mA
Maximum plate voltage, triode connection
400 V
TriodeConnection
Maximum plate dissipation, triode connection
26 W
TriodeConnection
Power output
11.3 W
ClassA;OneTube
Power output
17.5 W
ClassAB;PushPull
Power output
28 W
ClassAB;PushPull
Maximum plate voltage
400 V
Maximum screen voltage
400 V
Maximum plate dissipation
23 W
Maximum screen dissipation
3 W

Data set 04

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

Voltage
6.3 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Current
900 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 1 -No Connec — published value 1
1
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 1 -No Connec — published value 2
5
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
tion
7
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 2 -Heater
2
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 3 -Plate
3
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Pin 4 -Grid No.2
4
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 1
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 2
300 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 3
350 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.2 Voltage — published value 1
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.2 Voltage — published value 2
200 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.2 Voltage — published value 3
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 1
-14 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 2
-12.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Voltage — published value 3
-18 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Peak AF Grid-No.1 Voltage — published value 1
14 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Peak AF Grid-No.1 Voltage — published value 2
12.5 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Peak AF Grid-No.1 Voltage — published value 3
18 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Plate Current — published value 1
75 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Plate Current — published value 2
48 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Plate Current — published value 3
53 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Grid-No.2 Current — published value 1
4.3 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Grid-No.2 Current — published value 2
2.5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Grid-No.2 Current — published value 3
2.5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Resistance (Approx.) — published value 1
30000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Resistance (Approx.) — published value 2
35000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Resistance (Approx.) — published value 3
48000 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance — published value 1
6100
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance — published value 2
5300
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance — published value 3
5200
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Load Resistance — published value 1
2500 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Load Resistance — published value 2
4500 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Load Resistance — published value 3
4200 ohm
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
For cathode-bias operation
0.5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 1
250 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Plate Voltage — published value 2
300 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.1 (Control-Grid) Voltage — published value 1
-18 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Grid-No.1 (Control-Grid) Voltage — published value 2
-20 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Peak AF Grid-No.1 Voltage — published value 1
18 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Peak AF Grid-No.1 Voltage — published value 2
20 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Plate Current — published value 1
52 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Zero-Signal Plate Current — published value 2
78 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Transconductance
5250
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.

Other

PLATE VOLTAGE
400 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
ARID-No.2 (SCREEN-GRID) VOLTAGE
400 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
GRID-No.2 INPUT
3 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
PLATE DISSIPATION
23 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater negative with respect to cathode
200 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater positive with respect to cathode
200 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Plate Current — published value 1
80 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Plate Current — published value 2
55 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Plate Current — published value 3
65 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Grid-No.2 Current — published value 1
7.6 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Grid-No.2 Current — published value 2
4.7 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Grid-No.2 Current — published value 3
8.5 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Power Output — published value 1
6.7 W
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Power Output — published value 2
6.5 W
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Power Output — published value 3
11.3 W
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
For fixed-bias operation
0.1 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
PLATE DISSIPATION
26 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater negative with respect to cathode
200 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Heater positive with respect to cathode
200 V
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Plate Current — published value 1
58 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.
Max.-Signal Plate Current — published value 2
85 mA
Published datasheet value; multiple values on a source row represent separate source-table conditions or limits.

Data set 05

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Power Output
6.7 W
ClassA;OneTube;Plate 250 V;Screen 250 V;Load 2.5 kohm
Power Output
17.5 W
PushPull;TwoTubes;Plate 270 V;Screen 270 V;Load 5 kohm

Data set 06

2026 Sovtek

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Power Output
-
HI-FI audio output service

Data set 07

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Power Output
-
HI-FI audio output; Class A/push-pull data published