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Voltage Triode Pentode ·Pentode-Triode

6KR8

Medium-mu triode plus sharp-cutoff pentode; the pentode serves as a television video amplifier and the triode as a general-purpose amplifier.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9DX
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 750 mA

Description

Medium-mu triode plus sharp-cutoff pentode; the pentode is used as a television video amplifier and the triode as a general-purpose amplifier.

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

9DX - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN22G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN32PBP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN5H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN61G3AG3 — Suppressor GridGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN6ISAIS — Internal ScreenGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN61KAK — CathodeGroup 9DX6

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN71G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN81G2AG2 — Screen Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

PIN91PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9DX

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
60000 Ω
Transconductance
0.02 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
5 W
Max screen dissipation
1.1 W

Promoted from published ratings/characteristics where directly applicable; additional published values retained in TUBE_SECTION_PARAMETER.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
4400 Ω
Transconductance
0.0104 S
Amplification factor
46
Max plate voltage
330 V
Max plate dissipation
2 W

Promoted from published ratings/characteristics where directly applicable; additional published 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

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

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

    10 microseconds

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Voltage (ac/dc) 6.3

    10.5 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Current 0.7B

    450 mA

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 6KR8 target datasheet entry; Section2

  • _

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

  • 330

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Grid-No. 1 (Control-Grid) Voltage, Positive-bias value 0

    0 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Plate Dissipation 2

    5 W

    Published in approved 6KR8 target datasheet entry; Section2

  • For voltages up to

    165 V

    Published in approved 6KR8 target datasheet entry; Section2

  • — See curve page

    300 W

    Published in approved 6KR8 target datasheet entry; Section2

  • For voltages between 165 and

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Transconductance 10400

    20000 µS

    Published in approved 6KR8 target datasheet entry; Section2

  • Plate Current 15 54

    19.5 mA

    Published in approved 6KR8 target datasheet entry; Section2

  • Grid-No.2 Current — 13.5

    3 mA

    Published in approved 6KR8 target datasheet entry; Section2

  • of 100 juA — —

    6.3 V

    Published in approved 6KR8 target datasheet entry; Section2

  • For fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6KR8 target datasheet entry; Section2

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6KR8 target datasheet entry; Section2

  • quency in the order of

    40 MHz

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Voltage (ac/dc) 3.5 4.5

    6.3 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Current 0.6 0.45

    300 mA

    Published in approved 6KR8 target datasheet entry; Section2

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 6KR8 target datasheet entry; Section2

  • Plate Voltage

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Grid-No.3 (Suppressor-Grid) Voltage

    0 V

    Published in approved 6KR8 target datasheet entry; Section2

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

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Grid-No.l (Control-Grid) Voltage

    0 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Plate Dissipation

    3.1 W

    Published in approved 6KR8 target datasheet entry; Section2

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6KR8 target datasheet entry; Section2

  • For grid-No.2 voltages up to 165 volts

    0.6 W

    Published in approved 6KR8 target datasheet entry; Section2

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6KR8 target datasheet entry; Section2

Characteristic

  • Plate Supply Voltage 125 35

    200 V

    Published in approved 6KR8 target datasheet entry; Section2

  • Grid-No.2 Supply Voltage — 100

    100 V

    Published in approved 6KR8 target datasheet entry; Section2

  • 4400

    60000 Ω

    Published in approved 6KR8 target datasheet entry; Section2

Capacitance

  • Internal Shield

    9.5 pF

    Published in approved 6KR8 target datasheet entry; Section2

SECTION 2

Triode

Other

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

    10 microseconds

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Voltage (ac/dc) 6.3

    10.5 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Current 0.7B

    450 mA

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 6KR8 target datasheet entry; Section1

  • _

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

  • 330

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Grid-No. 1 (Control-Grid) Voltage, Positive-bias value 0

    0 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Plate Dissipation 2

    5 W

    Published in approved 6KR8 target datasheet entry; Section1

  • For voltages up to

    165 V

    Published in approved 6KR8 target datasheet entry; Section1

  • — See curve page

    300 W

    Published in approved 6KR8 target datasheet entry; Section1

  • For voltages between 165 and

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Transconductance 10400

    20000 µS

    Published in approved 6KR8 target datasheet entry; Section1

  • Plate Current 15 54

    19.5 mA

    Published in approved 6KR8 target datasheet entry; Section1

  • Grid-No.2 Current — 13.5

    3 mA

    Published in approved 6KR8 target datasheet entry; Section1

  • of 100 juA — —

    6.3 V

    Published in approved 6KR8 target datasheet entry; Section1

  • For fixed-bias operation 0.5

    0.5 MΩ

    Published in approved 6KR8 target datasheet entry; Section1

  • For cathode-bias operation 1

    1 MΩ

    Published in approved 6KR8 target datasheet entry; Section1

  • quency in the order of

    40 MHz

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Voltage (ac/dc) 3.5 4.5

    6.3 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved 6KR8 target datasheet entry; Section1

  • Heater Warm-up Time (Average) 11

    11 seconds

    Published in approved 6KR8 target datasheet entry; Section1

  • Plate Voltage

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Grid-No.3 (Suppressor-Grid) Voltage

    0 V

    Published in approved 6KR8 target datasheet entry; Section1

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

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Grid-No.l (Control-Grid) Voltage

    0 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Plate Dissipation

    3.1 W

    Published in approved 6KR8 target datasheet entry; Section1

  • For grid-No.2 voltages up to

    165 V

    Published in approved 6KR8 target datasheet entry; Section1

  • For grid-No.2 voltages up to 165 volts

    0.6 W

    Published in approved 6KR8 target datasheet entry; Section1

  • For grid-No.2 voltages between 165 and

    330 V

    Published in approved 6KR8 target datasheet entry; Section1

Characteristic

  • Plate Supply Voltage 125 35

    200 V

    Published in approved 6KR8 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage — 100

    100 V

    Published in approved 6KR8 target datasheet entry; Section1

  • 4400

    60000 Ω

    Published in approved 6KR8 target datasheet entry; Section1

Capacitance

  • Internal Shield

    9.5 pF

    Published in approved 6KR8 target datasheet entry; Section1