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Voltage - Dual Triode (similar high frequency) ·Triode-Triode

6BZ8

Medium-mu semi-remote-cutoff twin triode designed for low-noise VHF amplification, especially cascode television-tuner and controlled-gain RF applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 400 mA

Description

Medium-mu twin triode used as a cascode amplifier in VHF television tuners and in push-pull cathode-drive RF amplifiers.

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: 9AJ
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 400 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AJ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN22G1	B	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN32K	B	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN4H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN5H	—	H — Heater Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN61P	A	P — Plate (Anode) Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN71G1	A	G1 — Control Grid Source label preserved; pending confirmation	Unverified EIA Base Connections, printed page 131, 9AJ
PIN81K	A	K — Cathode Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ
PIN9IS	A	IS — Internal Screen Numbered source electrode preserved; manufacturer verification pending	Unverified EIA Base Connections, printed page 131, 9AJ

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5600 Ω
Transconductance: 0.008 S
Amplification factor: 45
Max plate voltage: 250 V
Max plate dissipation: 2.2 W
Max cathode current: 20 mA

Representative specification for repeated identical sections.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5600 Ω
Transconductance: 0.008 S
Amplification factor: 45
Max plate voltage: 250 V
Max plate dissipation: 2.2 W
Max cathode current: 20 mA

Medium-mu twin triode for low-noise VHF cascode-amplifier service.

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

Triode

Other

Plate Voltage
125 V
Published operating/characteristic table
Grid Voltage
-13 V
Published operating/characteristic table
Cathode Resistor
100 ohm
Published operating/characteristic table

Characteristic

Plate Current
10 mA
Published operating/characteristic table
Transconductance
1 uS
Published operating/characteristic table
Plate Resistance
5600 ohm
Published operating/characteristic table

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

GRID TO PLATE (G TO P)
1.15 µµf
Capacitances | GRID TO PLATE (G TO P) 1.15 µµf
PLATE TO CATHODE (P TO K)
0.15 µµf
Capacitances | PLATE TO CATHODE (P TO K) 0.15 µµf
Grid-to-plate capacitance
1.15 pF
Section1
Inter-section plate capacitance
0.01 pF
Section1ToSection2

Other

HEATER VOLTAGE
6.3 V
Maximum Ratings | HEATER VOLTAGE 6.3 VOLTS
MAXIMUM PLATE DISSIPATION
2.2 W
Maximum Ratings | MAXIMUM PLATE DISSIPATION 2.2 WATTS
MAXIMUM GRID CIRCUIT RESISTANCE O
1 Mohm
Maximum Ratings | MAXIMUM GRID CIRCUIT RESISTANCE O.1 MEGOHM
Plate voltage
125 V
ClassA
Cathode resistor
100 ohm
ClassA
Plate current
10 mA
ClassA
Cascode plate current
15 mA
Cascode Eb=250V

Characteristic

HEATER VOLTAGE b•
3 V
ClassA | HEATER VOLTAGE b•3 VOLTS
HEATER CURRENT D•
4 A
ClassA | HEATER CURRENT D•4 AMP.
PLATE VOLTAGE
125 V
ClassA | PLATE VOLTAGE 125 VOLTS
CATHODE RESISTOR
100 ohm
ClassA | CATHODE RESISTOR 100 OHMS
GRID VOLTAGE (APPROX.) FOR Gm
50 µMHOS
ClassA | GRID VOLTAGE (APPROX.) FOR Gm =50 µMHOS —13 VOLTS
GRID VOLTAGE (APPROX.) FOR Gm
13 V
ClassA | GRID VOLTAGE (APPROX.) FOR Gm =50 µMHOS —13 VOLTS
CASCO DE TRANSCONDUCTANCE (Eb
250 V
ClassA | CASCO DE TRANSCONDUCTANCE (Eb 250V Ec1 - p•SV) 10 000 µMHOS
CASCO DE TRANSCONDUCTANCE (Eb
0 µMHOS
ClassA | CASCO DE TRANSCONDUCTANCE (Eb 250V Ec1 - p•SV) 10 000 µMHOS
CASCODE PLATE CURRENT (Eb
250 V
ClassA | CASCODE PLATE CURRENT (Eb 250V Eli _p..S V) 15 MA.
CASCODE PLATE CURRENT (Eb
15 mA
ClassA | CASCODE PLATE CURRENT (Eb 250V Eli _p..S V) 15 MA.
Plate resistance
5600 ohm
Transconductance
8000 uS
Amplification factor
45
Cascode transconductance
10000 uS
Cascode Eb=250V

SECTION 2

Triode

Other

Plate voltage
125 V
ClassA
Cathode resistor
100 ohm
ClassA
Plate current
10 mA
ClassA

Characteristic

Plate resistance
5600 ohm
Transconductance
8000 uS
Amplification factor
45

Capacitance

Plate-to-cathode capacitance
0.15 pF
Section2

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage (ac/dc) 4.2
6.3 V
Published in approved 6BZ8 target datasheet entry; Section1
Heater Current 0.6
400 mA
Published in approved 6BZ8 target datasheet entry; Section1
Cathode Current
22 mA
Published in approved 6BZ8 target datasheet entry; Section1
Plate Dissipation
2.2 W
Published in approved 6BZ8 target datasheet entry; Section1
Cathode-Bias Resistor
220 Ω
Published in approved 6BZ8 target datasheet entry; Section1
Plate Resistance (Approx.)
5300 Ω
Published in approved 6BZ8 target datasheet entry; Section1
Plate Current
10 mA
Published in approved 6BZ8 target datasheet entry; Section1
Grid Voltage (Approx.) for transconductance of
50 µS
Published in approved 6BZ8 target datasheet entry; Section1
Grid Voltage (Approx.) for transconductance of 50 /imhos
-13 V
Published in approved 6BZ8 target datasheet entry; Section1

Capacitance

Grid to Plate 1.2
1.2 pF
Published in approved 6BZ8 target datasheet entry; Section1
Plate to Grid, Heater, and Internal Shield
2.4 pF
Published in approved 6BZ8 target datasheet entry; Section1
Plate to Cathode
0.12 pF
Published in approved 6BZ8 target datasheet entry; Section1
Heater to Cathode 2.8
2.8 pF
Published in approved 6BZ8 target datasheet entry; Section1