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Voltage - Triode (with diode, heptode or hexode) ·Diode-Diode-Triode

6BN8

Multi-section television tube combining twin diodes and high-mu twin triodes for burst, audio and oscillator functions, detector/discriminator service, and horizontal automatic-frequency control.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: 9ER
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 600 mA

Description

Twin-diode, high-mu twin-triode tube for television burst/audio/oscillator, detector, discriminator, and horizontal-AFC service.

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: 9ER
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9ER - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1Base Pin	C	P — Plate (Anode) Original chart label: 3P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN2Base Pin	C	K — Cathode Original chart label: 3K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN3Base Pin	B	K — Cathode Original chart label: 2K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN4Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN5Base Pin	—	H — Heater Original chart label: H; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN6Base Pin	B	P — Plate (Anode) Original chart label: 2P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN7Base Pin	A	P — Plate (Anode) Original chart label: 1P; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN8Base Pin	A	G1 — Control Grid Original chart label: 1G1; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER
PIN9Base Pin	A	K — Cathode Original chart label: 1K; manufacturer verification pending	Unverified EIA Base Connections, printed page 132, 9ER

Section ratings

3 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 125 V
Rectifier nominal output current: 9 mA
Rectifier peak forward current: 54 A
Rectifier forward voltage drop: 2.6 V

Representative row for two diode sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 28000 Ω
Transconductance: 0.0025 S
Amplification factor: 70
Max plate voltage: 330 V
Max plate dissipation: 1.74 W

High-mu triode plus two separate high-perveance diodes for monochrome and color television service.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Diode section.

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

Diode

Characteristic

AverageCurrentAt40VDC
50 mA
EachPlate

SECTION 2

Triode

Other

Plate Voltage
250 V
ClassA
Heater Warmup Time
11 s

Characteristic

Plate Current
1.6 mA
ClassA

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Maximum peak diode current
- to 54 mA
Diode1
Maximum continuous diode current
- to 1 mA
Diode1

Characteristic

Average diode current at 10 V
4 mA
Diode1

SECTION 2

Triode

Capacitance

Grid-to-plate capacitance
2.5 pF
Triode input capacitance
3.6 pF
Triode output capacitance
0.25 pF

Other

Plate voltage
100 V
ClassA
Plate current
1.5 mA
ClassA

Characteristic

Amplification factor
75
Plate resistance
21 kOhm

SECTION 3

Diode

Other

Maximum peak diode current
- to 54 mA
Diode2
Maximum continuous diode current
- to 1 mA
Diode2

Characteristic

Average diode current at 10 V
4 mA
Diode2

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Heater Voltage (ac/dc) 6.3
8.4 V
Published in approved 8BN8 target datasheet entry; Section2
Heater Current 0.6
450 mA
Published in approved 8BN8 target datasheet entry; Section2
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 8BN8 target datasheet entry; Section2
Plate Voltage
330 V
Published in approved 8BN8 target datasheet entry; Section2
Grid Voltage —1
-3 V
Published in approved 8BN8 target datasheet entry; Section2
Plate Resistance (Approx.) 21000
28000 Ω
Published in approved 8BN8 target datasheet entry; Section2
3600
2600 µS
Published in approved 8BN8 target datasheet entry; Section2
Plate Current 1.6
1.6 mA
Published in approved 8BN8 target datasheet entry; Section2
Grid Voltage (Approx.) for plate current of 10 /iA —2.6
-5.5 V
Published in approved 8BN8 target datasheet entry; Section2
Peak
54 mA
Published in approved 8BN8 target datasheet entry; Section2
Heater Voltage
6.3 V
Published in approved 8BN8 target datasheet entry; Section2
Heater Current
800 mA
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.2 (Screen-Grid) Supply Voltage
330 V
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 8BN8 target datasheet entry; Section2
Plate Dissipation
3.1 W
Published in approved 8BN8 target datasheet entry; Section2
Plate Voltage
125 V
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.2 Voltage
125 V
Published in approved 8BN8 target datasheet entry; Section2
Cathode-Bias Resistor
56 Ω
Published in approved 8BN8 target datasheet entry; Section2
Plate Resistance (Approx.)
0.2 MΩ
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.l-Circuit Resistance, for cathode-bias operation
0.25 MΩ
Published in approved 8BN8 target datasheet entry; Section2

Capacitance

Triode Grid to Triode Plate
2.6 pF
Published in approved 8BN8 target datasheet entry; Section2
Triode Grid to Cathode and Heater
3.6 pF
Published in approved 8BN8 target datasheet entry; Section2
Triode Plate to Cathode and Heater
0.26 pF
Published in approved 8BN8 target datasheet entry; Section2
Diode Cathode to All Other Electrodes (Each Diode Unit)
5 pF
Published in approved 8BN8 target datasheet entry; Section2
Diode Plate to Diode Cathode and Heater (Each Diode Unit)
1.9 pF
Published in approved 8BN8 target datasheet entry; Section2
Diode Cathode to Diode Plate and Heater (Each Diode Unit)
4.8 pF
Published in approved 8BN8 target datasheet entry; Section2
Diode Plate to All Other Electrodes (Each Diode Unit)
3 pF
Published in approved 8BN8 target datasheet entry; Section2

Characteristic

Transconductance
13000 µS
Published in approved 8BN8 target datasheet entry; Section2
Plate Current
11 mA
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.2 Current
3.8 mA
Published in approved 8BN8 target datasheet entry; Section2
Grid-No.l Voltage (Approx.) for plate current of 20 /iA
3 V
Published in approved 8BN8 target datasheet entry; Section2

SECTION 2

Triode

Other

Heater Voltage (ac/dc) 6.3
8.4 V
Published in approved 8BN8 target datasheet entry; Section1
Heater Current 0.6
450 mA
Published in approved 8BN8 target datasheet entry; Section1
Heater Warm-up Time (Average) 11
11 seconds
Published in approved 8BN8 target datasheet entry; Section1
Plate Voltage
330 V
Published in approved 8BN8 target datasheet entry; Section1
Grid Voltage —1
-3 V
Published in approved 8BN8 target datasheet entry; Section1
Plate Resistance (Approx.) 21000
28000 Ω
Published in approved 8BN8 target datasheet entry; Section1
3600
2600 µS
Published in approved 8BN8 target datasheet entry; Section1
Plate Current 1.6
1.6 mA
Published in approved 8BN8 target datasheet entry; Section1
Grid Voltage (Approx.) for plate current of 10 /iA —2.6
-5.5 V
Published in approved 8BN8 target datasheet entry; Section1
Peak
54 mA
Published in approved 8BN8 target datasheet entry; Section1
Heater Voltage
6.3 V
Published in approved 8BN8 target datasheet entry; Section1
Heater Current
800 mA
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.2 (Screen-Grid) Supply Voltage
330 V
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.l (Control-Grid) Voltage, Positive-bias value
0 V
Published in approved 8BN8 target datasheet entry; Section1
Plate Dissipation
3.1 W
Published in approved 8BN8 target datasheet entry; Section1
Plate Voltage
125 V
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.2 Voltage
125 V
Published in approved 8BN8 target datasheet entry; Section1
Cathode-Bias Resistor
56 Ω
Published in approved 8BN8 target datasheet entry; Section1
Plate Resistance (Approx.)
0.2 MΩ
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.l-Circuit Resistance, for cathode-bias operation
0.25 MΩ
Published in approved 8BN8 target datasheet entry; Section1

Capacitance

Triode Grid to Triode Plate
2.6 pF
Published in approved 8BN8 target datasheet entry; Section1
Triode Grid to Cathode and Heater
3.6 pF
Published in approved 8BN8 target datasheet entry; Section1
Triode Plate to Cathode and Heater
0.26 pF
Published in approved 8BN8 target datasheet entry; Section1
Diode Cathode to All Other Electrodes (Each Diode Unit)
5 pF
Published in approved 8BN8 target datasheet entry; Section1
Diode Plate to Diode Cathode and Heater (Each Diode Unit)
1.9 pF
Published in approved 8BN8 target datasheet entry; Section1
Diode Cathode to Diode Plate and Heater (Each Diode Unit)
4.8 pF
Published in approved 8BN8 target datasheet entry; Section1
Diode Plate to All Other Electrodes (Each Diode Unit)
3 pF
Published in approved 8BN8 target datasheet entry; Section1

Characteristic

Transconductance
13000 µS
Published in approved 8BN8 target datasheet entry; Section1
Plate Current
11 mA
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.2 Current
3.8 mA
Published in approved 8BN8 target datasheet entry; Section1
Grid-No.l Voltage (Approx.) for plate current of 20 /iA
3 V
Published in approved 8BN8 target datasheet entry; Section1