Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - TV Vertical Output ·BeamPower-Triode

6LR8

Multi-section television tube incorporating a beam-power section intended for vertical-deflection output, paired with a small-signal section for oscillator or driver functions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9QT
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 1.5 A

Description

High-mu triode plus beam-power section used as a combined vertical-deflection oscillator and amplifier in 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
9QT
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
1.5 A
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9QT - 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
16000 Ω
Transconductance
0.0036 S
Amplification factor
58
Max plate voltage
400 V
Max plate dissipation
2.5 W
Max cathode current
30 mA

Vertical-deflection oscillator triode unit.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
12000 Ω
Transconductance
0.0093 S
Amplification factor
6.5
Max plate voltage
400 V
Max screen voltage
300 V
Max plate dissipation
14 W
Max screen dissipation
2.75 W
Max cathode current
75 mA

Vertical-deflection amplifier beam-power unit.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Maximum Plate Voltage

    400 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Cathode Current

    30 mA

Characteristic

  • Plate Resistance

    16000 ohm

  • Transconductance

    3600 uS

  • Amplification Factor

    58

  • Interelectrode Capacitances Published

    true

SECTION 2

Beam Power

Other

  • Maximum Plate Voltage

    400 V

  • Maximum Screen Voltage

    300 V

  • Maximum Plate Dissipation

    14 W

  • Maximum Screen Dissipation

    2.75 W

  • Maximum Cathode Current

    75 mA

Characteristic

  • Plate Resistance

    12000 ohm

  • Transconductance

    9300 uS

  • Amplification Factor

    6.5

  • Interelectrode Capacitances Published

    true

Data set 02

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage 6.3 21

    31.5 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Heater Current 1.5 0.45

    300 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Heater Warm-up Time . 11

    11 seconds

    Published in approved 31LR8 target datasheet entry; Section1

  • Flate Voltage 400

    400 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.2 Voltage

    300 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Peak Cathode Current 105

    260 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Average Cathode Current 30

    75 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Dissipation!: 2.5

    14 W

    Published in approved 31LR8 target datasheet entry; Section1

  • # Pulse duration must not exceed 15% of a horizontal scanning cycle (

    10 microseconds

    Published in approved 31LR8 target datasheet entry; Section1

  • Heater Voltage 6.3 8.1

    11.4 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Heater Current 0.6 0.45

    315 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Heater Warm-up Time (Average) 11 11

    11 seconds

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Voltage

    330 V

    Published in approved 31LR8 target datasheet entry; Section1

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

    330 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage, Positive-bias value

    0 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Dissipation

    3.1 W

    Published in approved 31LR8 target datasheet entry; Section1

  • For grid-No 2 voltages up to

    165 V

    Published in approved 31LR8 target datasheet entry; Section1

  • For grid-No 2 voltages up to 165 volts

    0.65 W

    Published in approved 31LR8 target datasheet entry; Section1

  • For grid-No.2 voltages between 165 and

    33 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Voltage

    125 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.2 Voltage

    125 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Cathode-Bias Resistor

    56 Ω

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Resistance (Approx.)

    200000 Ω

    Published in approved 31LR8 target datasheet entry; Section1

Characteristic

  • Plate Voltage 250 45 135

    120 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage —4 0 —10

    -10 V

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Resistance Approx.) 14000

    14000 Ω

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Current 2.S 200

    51 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • For plate current of

    1 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Transconductance

    13000 µS

    Published in approved 31LR8 target datasheet entry; Section1

  • Plate Current

    10 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.2 Current

    3.4 mA

    Published in approved 31LR8 target datasheet entry; Section1

  • Grid-No.l Voltage (Approx.) for plate current of 20 /lA

    -3.5 V

    Published in approved 31LR8 target datasheet entry; Section1

SECTION 2

Beam Power

Other

  • Heater Voltage 6.3 21

    31.5 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Heater Current 1.5 0.45

    300 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Heater Warm-up Time . 11

    11 seconds

    Published in approved 31LR8 target datasheet entry; Section2

  • Flate Voltage 400

    400 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.2 Voltage

    300 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Peak Cathode Current 105

    260 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Average Cathode Current 30

    75 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Dissipation!: 2.5

    14 W

    Published in approved 31LR8 target datasheet entry; Section2

  • # Pulse duration must not exceed 15% of a horizontal scanning cycle (

    10 microseconds

    Published in approved 31LR8 target datasheet entry; Section2

  • Heater Voltage 6.3 8.1

    11.4 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Heater Current 0.6 0.45

    315 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Heater Warm-up Time (Average) 11 11

    11 seconds

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Voltage

    330 V

    Published in approved 31LR8 target datasheet entry; Section2

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

    330 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage, Positive-bias value

    0 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Dissipation

    3.1 W

    Published in approved 31LR8 target datasheet entry; Section2

  • For grid-No 2 voltages up to

    165 V

    Published in approved 31LR8 target datasheet entry; Section2

  • For grid-No 2 voltages up to 165 volts

    0.65 W

    Published in approved 31LR8 target datasheet entry; Section2

  • For grid-No.2 voltages between 165 and

    33 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Voltage

    125 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.2 Voltage

    125 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Cathode-Bias Resistor

    56 Ω

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Resistance (Approx.)

    200000 Ω

    Published in approved 31LR8 target datasheet entry; Section2

Characteristic

  • Plate Voltage 250 45 135

    120 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage —4 0 —10

    -10 V

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Resistance Approx.) 14000

    14000 Ω

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Current 2.S 200

    51 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • For plate current of

    1 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Transconductance

    13000 µS

    Published in approved 31LR8 target datasheet entry; Section2

  • Plate Current

    10 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.2 Current

    3.4 mA

    Published in approved 31LR8 target datasheet entry; Section2

  • Grid-No.l Voltage (Approx.) for plate current of 20 /lA

    -3.5 V

    Published in approved 31LR8 target datasheet entry; Section2