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6BU8

Sharp-cutoff twin pentode designed for television sync-separator, sync-clipper, and AGC-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9FG
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Sharp-cutoff twin pentode for sync separator, sync clipper, and AGC amplifier service. The supplied datasheet was read for heater data, maximum ratings, characteristics, typical operating information, and interelectrode capacitances where published.

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: 9FG
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9FG - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	—	K — Cathode Original chart label: K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN2Base Pin	—	G2 — Screen GridGroup 9FG2 Original chart label: G2; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN2Base Pin	—	IS — Internal ScreenGroup 9FG2 Original chart label: IS; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN3Base Pin	B	P — Plate (Anode) Original chart label: 2P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN6Base Pin	B	G3 — Suppressor Grid Original chart label: 2G3; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN7Base Pin	—	G1 — Control Grid Original chart label: G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN8Base Pin	A	P — Plate (Anode) Original chart label: 1P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG
PIN9Base Pin	A	G3 — Suppressor Grid Original chart label: 1G3; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9FG

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0015 S
Max plate voltage: 300 V
Max screen voltage: 150 V
Max plate dissipation: 1.1 W
Max screen dissipation: 0.75 W
Max cathode current: 12 mA

Shared twin-pentode ratings; representative row.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00018 S
Max plate voltage: 100 V
Max screen voltage: 150 V
Max plate dissipation: 1 W
Max screen dissipation: 0.75 W

Published promoted values applied where applicable; additional table data retained as parameters.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate Voltage
100 V
Published operating/characteristic table
Screen Voltage
67.5 V
Published operating/characteristic table

Characteristic

Plate Current
2 mA
Published operating/characteristic table
Screen Current
3.3 mA
Published operating/characteristic table

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater Voltage
6.3 V
Heater Current
300 mA

Other

Maximum Plate Voltage
300 V
Maximum Plate Dissipation
2.5 W

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

Grid3-to-plate capacitance
1.9 pF
EachSection

Other

Plate voltage
100 V
BothSections
Screen voltage
67.5 V
BothSections
Plate current
2.2 mA
EachSection

SECTION 2

Pentode

Other

Plate voltage
100 V
BothSections
Screen voltage
67.5 V
BothSections
Plate current
2.2 mA
EachSection

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Typical Plate Voltage
100 V
BothSectionsOperating
Typical Screen Voltage
67.5 V
BothSectionsOperating

Characteristic

Grid3 Transconductance
180 uS
SeparateSectionTest

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Voltage (AC or DC) — published value 1
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Voltage (AC or DC) — published value 2
10 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at 6.3 volts — published value 1
6.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Current at 6.3 volts — published value 2
0.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.3 to plate (Each unit)
1.9
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid No.l to all other electrodes
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage (Each Unit) — published value 1
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage (Each Unit) — published value 2
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3 Voltage (Each Unit) — published value 1
-10 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3 Voltage (Each Unit) — published value 2
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Voltage — published value 1
67.5 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Voltage — published value 2
67.5 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Current (Each Unit)
2.2 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Current — published value 1
6.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.2 Current — published value 2
3.3 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Cathode Current — published value 1
6.6 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Cathode Current — published value 2
7.8 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 1
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Voltage — published value 2
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3 Voltage — published value 1
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3 Voltage — published value 2
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.l Voltage
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3-to-Plate Transconductance
180
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.l-to-Plate Transconductance
1500
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Current
2.2 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
plate µa = 100 — published value 1
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
plate µa = 100 — published value 2
-4.5 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
plate µa = 100 — published value 1
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
plate µa = 100 — published value 2
-2.3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1-Cathode — published value 1
1
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 1-Cathode — published value 2
6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 2-Grid No.2,
2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Internal
7
Published datasheet value; multiple values represent separate source-table limits or conditions.
Shield
8
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 3-Plate of
3
Published datasheet value; multiple values represent separate source-table limits or conditions.
Unit No.2
9
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 4 -Heater
4
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 5 -Heater
5
Published datasheet value; multiple values represent separate source-table limits or conditions.
b Adjusted to give ado grid—No.l current of 100 microamperes
100 A
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-N~3 VOLTS=O
3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-N=2 VOLTS= 67.5 — published value 1
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-N=2 VOLTS= 67.5 — published value 2
67.5 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE AND GRID N'3 OF
3
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-N~2 VOLTS=67.S — published value 1
2 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-N~2 VOLTS=67.S — published value 2
67 V
Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

PLATE VOLTAGE (Each unit)
300 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Negative-bias value
0 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Positive-bias value
3 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-No.2 (SCREEN-GRID) VOLTAGE
150 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Negative-bias value
50 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
CATHODE CURRENT
12 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
GRID-No.2 INPUT
0.75 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE DISSIPATION (Each unit) — published value 1
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE DISSIPATION (Each unit) — published value 2
1 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater negative with respect to cathode. 200 max
200 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater positive with respect to cathode. 2004 max
2004 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.3-Circuit Resistance (Each unit)
0.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.l-Circuit Resistance — published value 1
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-No.l-Circuit Resistance — published value 2
5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Tube Voltage Drop for plate current of 140 mA
12 volts
Published datasheet value
Heater Warm-up Time (Average) 11
11 seconds
Published datasheet value
Plate Voltage (Each Unit)
300 volts
Published datasheet value
DC negative value
50 volts
Published datasheet value
DC positive value
3 volts
Published datasheet value
Grid-No.2 (Screen-Grid) Voltage
150 volts
Published datasheet value
Cathode Current
12 mA
Published datasheet value
Grid-No.2 Input
0.75 watt
Published datasheet value
Plate Current (Each Unit)
2.2 mA
Published datasheet value
Grid-No.3 Transconductance
180 µS
Published datasheet value
Plate Current —
2.2 mA
Published datasheet value
100 aA —
-4.6 volts
Published datasheet value
100 M —
-2.3 volts
Published datasheet value
Grid-No.3-Circuit Resistance (Each Unit)
0.5 megohm
Published datasheet value
Grid-No.l-Circuit Resistance
0.5 megohm
Published datasheet value
Heater Warm-up Time
11 seconds
Published datasheet value
Transconductance
0.00018 A/V
Promoted from published datasheet table

Capacitance

Grid No. 3 to Plate (Each Unit)
1.9 PF
Published datasheet value
Grid No.l to All Other Electrodes
6 PF
Published datasheet value
Grid No.3 to All Other Electrodes (Each Unit)
3.6 PF
Published datasheet value
Plate to All Other Electrodes (Each Unit)
3 PF
Published datasheet value
Grid No.l to Plate
0.1 PF
Published datasheet value

Other

Peak positive value
50 volts
Published datasheet value
Plate Dissipation (Each Unit)
1.1 watts
Published datasheet value
Maximum Screen Voltage
150 V
Promoted from published datasheet table
Maximum Plate Dissipation
1.1 W
Promoted from published datasheet table