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7189

High-performance beam-power pentode designed for audio-frequency output stages, widely suited to high-fidelity and receiving-equipment power amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 760 mA

Description

7189 is a Pentode vacuum tube documented in the RCA Receiving Tube Manual. The supplied excerpt was reviewed for heater data, section arrangement, maximum ratings, electrical characteristics, interelectrode capacitances, typical operating conditions, and stated applications.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 760 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

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: 40000 Ω
Transconductance: 0.0113 S
Amplification factor: 19.5
Max plate voltage: 400 V
Max screen voltage: 300 V
Max plate dissipation: 12 W
Max screen dissipation: 4 W
Max cathode current: 65 mA

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 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater Voltage
6.3 V
Heater Current
760 mA

Other

Maximum Signal Power Output
24 W
PushPull;PentodeConnection

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Plate Voltage
250 V
TypicalCharacteristics
Screen Voltage
250 V
TypicalCharacteristics
Power Output
24 W
ClassAB;FixedBias;PushPull;TwoTubes
Power Output
16.5 W
ClassAB;CathodeBias;PushPull;TwoTubes;UltraLinear

Characteristic

Plate Current
48 mA
Screen Current
9.9 mA

Capacitance

Input Capacitance
10.8 pF
Output Capacitance
5.5 pF

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater/filament voltage
6.3 V
Published rating
Heater/filament current
760 mA
Published rating
Transconductance
11300 µS
AudioPower

Other

Plate voltage
250 V
AudioPower
Screen voltage
250 V
AudioPower
Control-grid bias
-7.3 V
AudioPower
Plate current
45 mA
AudioPower
Screen current
5.5 mA
AudioPower
Power output
19.5 W
PushPull TwoTubes

Data set 04

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristic

Heater Voltage
6.3 V
Heater Current
760 mA
GridToPlateCapacitanceMaximum
0.5 pF
Input Capacitance
10 pF
Output Capacitance
6.5 pF
Transconductance
11300 uS
Plate Resistance
38000 ohm
Amplification Factor
19

Other

Plate Voltage
350 V
ClassA
Screen Voltage
300 V
ClassA
Plate Current
48 mA
ClassA
Power Output
5.7 W
ClassA
Power Output
17 W
TwoTubes;PushPull;ClassAB

Data set 05

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Nominal
Heater current
760 mA
Nominal
Maximum plate voltage
400 V
Promoted published value
Maximum plate dissipation
12 W
Promoted published value
Maximum cathode current
65 mA
Promoted published value
MAXIMUM PLATE VOLTAGE 4OO VOLTS
4 V
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM PLATE DISSIPATION
12 W
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM GRID #2 VOLTAGE 3OO VOLTS
3 V
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM GRID #2 DISSIPATION (ZERO SIGNAL) 2.O WATTS
2 W
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM GRID #2 DISSIPATION (MAX. SIGNAL)
4 W
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM CATHODE CURRENT
65 mA
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
MAXIMUM GRID RESISTANCE (FIXED BIAS) 3OO OOO OHMS
3 mA
CLASS A81 FIXEC BIAS AUDIO AMPLIFIER
PLATE VOLTAGE
250 V
TYPICAL CHARACTERISTICS
GRID #2 VOLTAGE 2SO VOLTS
2 V
TYPICAL CHARACTERISTICS
PLATE CURRENT
48 mA
TYPICAL CHARACTERISTICS
GRID #2 CURRENT
5.5 mA
TYPICAL CHARACTERISTICS
GRID #1 VOLTAGE —
7.3 V
TYPICAL CHARACTERISTICS
PLATE RESISTANCE u
0 ohm
TYPICAL CHARACTERISTICS
AMPLIFICATION FACTOR (GRID #1 TO GRID #2) 19.5
19.5 A
TYPICAL CHARACTERISTICS
GRID #1 VOLTAGE —T
5 V
TYPICAL OPERATION
PLATE TO PLATE L0.4D RESISTANCE 8 OOO OHMS
8 ohm
TYPICAL OPERATION
ELATE CURRENT (ZERO S16NAL) 2x
7.5 mA
TYPICAL OPERATION
PLATE CURRENT (MAX. SIGNAL) 2x
52.5 mA
TYPICAL OPERATION
;;RID #"t CURRENT (MAX. SIGNAL) 2X
12.5 mA
TYPICAL OPERATION
PLATE AND GRID #2 SUPPLY VOLTAGE ~~~ VOLTS
2 V
CLASS AB1 AUDIO AMPLIFIER
GRIC #2 DISSIPATION (ZERO SIGNAL)
2 W
CLASS AB1 AUDIO AMPLIFIER
CATHODE CURRENT
65 mA
CLASS AB1 AUDIO AMPLIFIER
PLATE SUPPLY VOLTAGE
375 V
TYPICAL OPERATION
COMMON CATHODE RESISTANCE 22O OHMS
22 ohm
TYPICAL OPERATION
PLATE AND GRID #2 CURRENT (MAX. SIGNAL) 2X
40.5 mA
TYPICAL OPERATION
INPUT SIGNAL VOLTAGE, RMS L2.~ VOLTS
2 V
TYPICAL OPERATION
POWER OUTPUT T
6.5 W
TYPICAL OPERATION

Characteristic

Plate resistance
40000 ohm
Promoted published value
Transconductance
11300 uS
Promoted published value

Capacitance

OUTPUT CAPACITANCE ~.
5 pF
DIRECT INTERELECTRODE CAPACITANCES

Data set 06

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
760 mA
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid voltage
-7.3 V
ClassA
Plate current
48 mA
ClassA
Screen current
5.5 mA
ClassA
Push-pull plate voltage
400 V
ClassAB1;TwoTubes
Push-pull power output
24 W
ClassAB1;TwoTubes

Characteristic

Plate resistance
40000 ohm
ClassA
Transconductance
11300 uS
ClassA
Screen-to-control-grid mu factor
19.5

Capacitance

Grid-to-plate capacitance
0.5 pF

Data set 07

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Heater voltage
6.3 V
Heater current
760 mA
Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Plate current
48 mA
ClassA
Maximum plate voltage
400 V
Maximum screen voltage
300 V
Push-pull power output
24 W
ClassAB1;TwoTubes

Characteristic

Plate resistance
40000 ohm
ClassA
Transconductance
11300 uS
ClassA
Screen-to-control-grid mu factor
19.5

Capacitance

Grid-to-plate capacitance
0.5 pF

Data set 08

2026 Tungsol Rebrand

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

Power Output
4.2 W
ClassA;OneTube;Plate 250 V;Screen 250 V;Load 5.2 kohm