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Power - Pentode (NOT beam) ·Pentode-Triode

6GW8

High-mu triode plus sharp-cutoff power pentode used in audio preamplifier and output stages of audio equipment and television receivers, integrating voltage gain and power output in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9LZ
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 660 mA

Description

High-mu triode plus sharp-cutoff power pentode used in audio preamplifier and output stages of audio equipment and television receivers.

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

9LZ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
45000 Ω
Transconductance
0.0016 S
Amplification factor
100
Max plate voltage
330 V
Max plate dissipation
0.5 W
Max cathode current
4 mA

Published maximum ratings and characteristic values promoted where applicable; additional table values retained in TUBE_SECTION_PARAMETER.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
48000 Ω
Transconductance
0.01 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
9 W
Max screen dissipation
1.8 W
Max cathode current
55 mA

Published maximum ratings and characteristic values promoted where applicable; additional table values retained in TUBE_SECTION_PARAMETER.

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

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater voltage

    6.3 V

    Published heater rating

  • Heater current

    700 mA

    Published heater rating

  • Triode amplification factor

    100

    TriodeSection AFAmplifier

Other

  • Triode plate voltage

    250 V

    TriodeSection AFAmplifier

  • Triode control-grid bias

    -1.7 V

    TriodeSection AFAmplifier

  • Triode plate current

    1.2 mA

    TriodeSection AFAmplifier

SECTION 2

Pentode

Other

  • Pentode plate voltage

    250 V

    PentodeSection AFAmplifier

  • Pentode screen voltage

    250 V

    PentodeSection AFAmplifier

  • Pentode control-grid bias

    -7 V

    PentodeSection AFAmplifier

  • Pentode plate current

    36 mA

    PentodeSection AFAmplifier

  • Pentode screen current

    5.5 mA

    PentodeSection AFAmplifier

Characteristic

  • Pentode plate resistance

    45000 ohm

    PentodeSection AFAmplifier

  • Pentode transconductance

    10000 µS

    PentodeSection AFAmplifier

Data set 02

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • c ap - gt <

    0.006 pF

    Published in approved ECL86 target datasheet entry; Section1

  • c at - gl <

    0.2 pF

    Published in approved ECL86 target datasheet entry; Section1

  • ( cgt - gl <

    0.02 pF

    Published in approved ECL86 target datasheet entry; Section1

  • c at - ap <

    0.15 pF

    Published in approved ECL86 target datasheet entry; Section1

  • cin

    10 pF

    Published in approved ECL86 target datasheet entry; Section1

  • ca - gl <

    0.4 pF

    Published in approved ECL86 target datasheet entry; Section1

  • c in 2

    3 pF

    Published in approved ECL86 target datasheet entry; Section1

  • cout 2

    5 pF

    Published in approved ECL86 target datasheet entry; Section1

  • ca - g 1

    4 pF

    Published in approved ECL86 target datasheet entry; Section1

  • cg - h < 6

    0 pF

    Published in approved ECL86 target datasheet entry; Section1

  • gm

    10 mA

    Published in approved ECL86 target datasheet entry; Section1

  • gm 1

    6 mA

    Published in approved ECL86 target datasheet entry; Section1

  • Yin (r .m. s .) (Po ut =

    50 mW

    Published in approved ECL86 target datasheet entry; Section1

  • Yin (r .m .s .) (P out =

    50 mW

    Published in approved ECL86 target datasheet entry; Section1

  • Yin (r .m .s .) (P out = 50 mW) 480

    520 mV

    Published in approved ECL86 target datasheet entry; Section1

SECTION 2

Pentode

Other

  • c ap - gt <

    0.006 pF

    Published in approved ECL86 target datasheet entry; Section2

  • c at - gl <

    0.2 pF

    Published in approved ECL86 target datasheet entry; Section2

  • ( cgt - gl <

    0.02 pF

    Published in approved ECL86 target datasheet entry; Section2

  • c at - ap <

    0.15 pF

    Published in approved ECL86 target datasheet entry; Section2

  • cin

    10 pF

    Published in approved ECL86 target datasheet entry; Section2

  • ca - gl <

    0.4 pF

    Published in approved ECL86 target datasheet entry; Section2

  • c in 2

    3 pF

    Published in approved ECL86 target datasheet entry; Section2

  • cout 2

    5 pF

    Published in approved ECL86 target datasheet entry; Section2

  • ca - g 1

    4 pF

    Published in approved ECL86 target datasheet entry; Section2

  • cg - h < 6

    0 pF

    Published in approved ECL86 target datasheet entry; Section2

  • gm

    10 mA

    Published in approved ECL86 target datasheet entry; Section2

  • gm 1

    6 mA

    Published in approved ECL86 target datasheet entry; Section2

  • Yin (r .m. s .) (Po ut =

    50 mW

    Published in approved ECL86 target datasheet entry; Section2

  • Yin (r .m .s .) (P out =

    50 mW

    Published in approved ECL86 target datasheet entry; Section2

  • Yin (r .m .s .) (P out = 50 mW) 480

    520 mV

    Published in approved ECL86 target datasheet entry; Section2

Data set 03

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current nominal

    660 mA

Characteristics

  • Voltage (AC or DC)

    6.3 V

    Published source row

  • Current at heater volts =

    6.3 V

    Published table column

  • Peak heater—cathode voltage

    100 V

    Published source row

SECTION 2

Pentode

Other

  • Heater voltage nominal

    6.3 V

  • Heater current nominal

    660 mA

  • Plate Supply Voltage

    550 V

    Published source row

  • Plate Supply Voltage (value 2)

    550 V

    Published source row

  • Plate Voltage

    300 V

    Published source row

  • Plate Voltage (value 2)

    300 V

    Published source row

  • Grid-No

    2 V

    Published source row

  • Grid-No (value 2)

    550 V

    Published source row

  • Grid-No

    2 V

    Published source row

  • Grid-No (value 2)

    300 V

    Published source row

  • Average Cathode Current

    4 mA

    Published source row

  • Average Cathode Current (value 2)

    55 mA

    Published source row

  • Grid-No

    2 W

    Published source row

  • Grid-No (value 2)

    1.8 W

    Published source row

  • Plate Dissipation

    0.5 W

    Published source row

  • Plate Dissipation (value 2)

    9 W

    Published source row

  • Grid-No.l Voltage at grid No

    1 V

    Published source row

  • Grid-No.l Voltage at grid No (value 2)

    0.3 V

    Published source row

  • Grid-No.l Voltage at grid No (value 3)

    -1.3 V

    Published source row

  • Grid-No

    1

    Published source row

Characteristics

  • Voltage (AC or DC)

    6.3 V

    Published source row

  • Current at heater volts =

    0.66 V

    Published table column

  • Peak heater—cathode voltage

    100 V

    Published source row

  • Plate Voltage

    250 V

    Published source row

  • Plate Voltage (value 2)

    250 V

    Published source row

  • Grid No

    2 V

    Published source row

  • Grid No (value 2)

    250 V

    Published source row

  • Grid No

    1 V

    Published source row

  • Grid No (value 2)

    -1.9 V

    Published source row

  • Grid No (value 3)

    -7 V

    Published source row

  • Plate Resistance (Approx.)

    48000 ohm

    Published source row

  • Transconductance

    1600 µS

    Published source row

  • Transconductance (value 2)

    10000 µS

    Published source row

  • Plate Current

    1.2 mA

    Published source row

  • Plate Current (value 2)

    36 mA

    Published source row

  • Grid-No

    2 mA

    Published source row

  • Grid-No (value 2)

    6 mA

    Published source row

Data set 04

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Supply Voltage 550

    550 V

    Published in approved ECL86 target datasheet entry; Section1

  • Plate Voltage 300

    300 V

    Published in approved ECL86 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Supply Voltage

    550 V

    Published in approved ECL86 target datasheet entry; Section1

  • Grid-No.2 Voltage

    300 V

    Published in approved ECL86 target datasheet entry; Section1

  • Cathode Current 4

    55 mA

    Published in approved ECL86 target datasheet entry; Section1

  • Plate Dissipation 0.5

    9 W

    Published in approved ECL86 target datasheet entry; Section1

  • Grid-No.2 Input

    1.5 W

    Published in approved ECL86 target datasheet entry; Section1

  • Plate Voltage 250

    250 V

    Published in approved ECL86 target datasheet entry; Section1

  • Grid-No. 1-Circuit Resistance, for fixed-bias operation 1

    0.5 MΩ

    Published in approved ECL86 target datasheet entry; Section1

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved ECL86 target datasheet entry; Section1

  • Heater Current

    400 mA

    Published in approved ECL86 target datasheet entry; Section1

Characteristic

  • Grid-No.l Voltage

    -1.9 V

    Published in approved ECL86 target datasheet entry; Section1

  • Plate Current 1.2

    36 mA

    Published in approved ECL86 target datasheet entry; Section1

Capacitance

  • andInternal Shield

    2.3 pF

    Published in approved ECL86 target datasheet entry; Section1

  • Grid No.l to Plate

    0.005 pF

    Published in approved ECL86 target datasheet entry; Section1

  • Internal Shield

    3.3 pF

    Published in approved ECL86 target datasheet entry; Section1

  • Grid No.l to Grid No.2

    1.6 pF

    Published in approved ECL86 target datasheet entry; Section1

SECTION 2

Pentode

Other

  • Plate Supply Voltage 550

    550 V

    Published in approved ECL86 target datasheet entry; Section2

  • Plate Voltage 300

    300 V

    Published in approved ECL86 target datasheet entry; Section2

  • Grid-No.2 (Screen-Grid) Supply Voltage

    550 V

    Published in approved ECL86 target datasheet entry; Section2

  • Grid-No.2 Voltage

    300 V

    Published in approved ECL86 target datasheet entry; Section2

  • Cathode Current 4

    55 mA

    Published in approved ECL86 target datasheet entry; Section2

  • Plate Dissipation 0.5

    9 W

    Published in approved ECL86 target datasheet entry; Section2

  • Grid-No.2 Input

    1.5 W

    Published in approved ECL86 target datasheet entry; Section2

  • Plate Voltage 250

    250 V

    Published in approved ECL86 target datasheet entry; Section2

  • Grid-No. 1-Circuit Resistance, for fixed-bias operation 1

    0.5 MΩ

    Published in approved ECL86 target datasheet entry; Section2

  • Heater Voltage (ac/dc)

    6.3 V

    Published in approved ECL86 target datasheet entry; Section2

  • Heater Current

    400 mA

    Published in approved ECL86 target datasheet entry; Section2

Characteristic

  • Grid-No.l Voltage

    -1.9 V

    Published in approved ECL86 target datasheet entry; Section2

  • Plate Current 1.2

    36 mA

    Published in approved ECL86 target datasheet entry; Section2

Capacitance

  • andInternal Shield

    2.3 pF

    Published in approved ECL86 target datasheet entry; Section2

  • Grid No.l to Plate

    0.005 pF

    Published in approved ECL86 target datasheet entry; Section2

  • Internal Shield

    3.3 pF

    Published in approved ECL86 target datasheet entry; Section2

  • Grid No.l to Grid No.2

    1.6 pF

    Published in approved ECL86 target datasheet entry; Section2