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

6BQ7A

Twin triode intended specifically for VHF cascode amplification, widely suited to television tuner RF front ends and related high-frequency amplifier circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

Indirectly heated dual triode intended for VHF cascode amplification.

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: 6100 Ω
Transconductance: 0.0064 S
Amplification factor: 39
Max plate voltage: 250 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

Each section; representative row.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7700 Ω
Transconductance: 0.006 S
Amplification factor: 38
Max plate voltage: 250 V
Max plate dissipation: 2 W
Max cathode current: 20 mA

High-frequency twin triode for VHF cascode and grounded-grid 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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
400 mA
Application
VHF cascode amplifier

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
ClassA

Characteristic

Plate resistance
6100 Ω
ClassA
Transconductance
6400 µS
ClassA
Amplification factor
39
ClassA

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate Voltage
150 V
Published operating/characteristic table
Grid Voltage
-2 V
Published operating/characteristic table

Characteristic

Plate Current
9 mA
Published operating/characteristic table
Transconductance
0 uS
Published operating/characteristic table
Plate Resistance
6100 ohm
Published operating/characteristic table

Data set 04

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
6.3 V
Heater current
400 mA
Plate resistance
7700 ohm
Transconductance
6000 uS
Amplification factor
38

Other

Maximum plate voltage
250 V
Maximum cathode current
20 mA
Maximum plate dissipation
2 W

Capacitance

Grid-to-plate capacitance
1.15 pF
Plate-to-cathode capacitance
0.15 pF

SECTION 2

Triode

Characteristics

Heater voltage
6.3 V
Heater current
400 mA
Plate resistance
7700 ohm
Transconductance
6000 uS
Amplification factor
38

Other

Maximum plate voltage
250 V
Maximum cathode current
20 mA
Maximum plate dissipation
2 W

Capacitance

Grid-to-plate capacitance
1.15 pF
Plate-to-cathode capacitance
0.15 pF

Data set 05

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
EachUnit; VHF
Plate current
9 mA
EachUnit; VHF

Characteristic

Amplification factor
39
EachUnit
Plate resistance
6.1 kOhm
EachUnit
Transconductance
6400 uS
EachUnit

Data set 06

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Typical Plate Voltage
150 V
ClassA
Typical Plate Current
9 mA
ClassA

Data set 07

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Amplificateur cascode V.H.F. 6 BQ
7 A
Heater voltage ....…...….rrsrmererrereeremensensnennnnnnnnsnneO V
6.3 V
Heater current ….…..……meersermerceneenenenssmnnmnnennMnÜ IË
400 mA
Tension d'ANOd@ …..…......+…ererserrenserecacesrrerececencecem VA
250 V
Cathode current… s0 1K
20 mA
Tension de crête entre ﬁlament et cathode … Vfker
200 V
Tension d'Anode …...…..…....….…rerseenenecsenmenenensansüs Va
150 V
Plate current …. . Ia
9 mA
Re51st ance de cathode … Rk
220 Ω
Résistarnce Interne …….….….….…uusmiceneenenmmnnnnnnmnnnnnn p
5900 Ω
Transconductance …… .8
6.4 mA/V
d'anode de 100 Â ... seserececserenmennnnnns VEbl
-6.5 V
bloqué, cette tension peut atteindre
300 V

Characteristic

Capacitance grille/anode …… Cg/a 1,15
1.15 pF
InterelectrodeCapacitance
Capacitance d'entrée (cucu1t cascode) Ce
4.95 pF
InterelectrodeCapacitance
Capacitance de sortie (c1rcu1t cascode) Cs
2.27 pF
InterelectrodeCapacitance
Capacitance filament/ cathode …………… Cf/k 2,65
2.7 pF
InterelectrodeCapacitance
6BQ
7 A
InterelectrodeCapacitance

Data set 08

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Voltage (AC or DC)
63 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid to plate — published value 1
1.2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid to plate — published value 2
1.2
Published datasheet value; multiple values represent separate source-table limits or conditions.
shield, and heater
2.6
Published datasheet value; multiple values represent separate source-table limits or conditions.
shield, and heater
5
Published datasheet value; multiple values represent separate source-table limits or conditions.
shield, and heater
1.2
Published datasheet value; multiple values represent separate source-table limits or conditions.
shield, and heater
2.2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate to cathode — published value 1
0.12
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate to cathode — published value 2
0.12
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater to cathode — published value 1
2.6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater to cathode — published value 2
2.6
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Supply Voltage
150 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Resistance (Approx )
5900 ohm
Published datasheet value; multiple values represent separate source-table limits or conditions.
Transconductance
6400
Published datasheet value; multiple values represent separate source-table limits or conditions.
Plate Current
9 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
,,..1 — published value 1
100 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
,,..1 — published value 2
-6.5 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 2 -Grid of — published value 1
2
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 2 -Grid of — published value 2
7
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 4 -Heater — published value 1
4
Published datasheet value; multiple values represent separate source-table limits or conditions.
Pin 4 -Heater — published value 2
9
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.
permissible for this voltage to be as high as 300 volts
300 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE VOLTS=150
150 V
Published datasheet value; multiple values represent separate source-table limits or conditions.

Other

and grid of unit No.l — published value 1
0 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
and grid of unit No.l — published value 2
24 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE VOLTAGE
2506 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
PLATE DISSIPATION
2 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
CATHODE CURRENT
20 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater negative with respect to cathode
2006 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Heater positive with respect to cathode
2004 V
Published datasheet value; multiple values represent separate source-table limits or conditions.
Grid-Circuit Resistance
0.5 mA
Published datasheet value; multiple values represent separate source-table limits or conditions.

Data set 09

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage (ac/dc) 4.2 5.6
6.3 V
Published in approved 6BZ7 target datasheet entry; Section1
Heater Current 0.45
400 mA
Published in approved 6BZ7 target datasheet entry; Section1
Cathode Current
20 mA
Published in approved 6BZ7 target datasheet entry; Section1
Plate Dissipation
2 W
Published in approved 6BZ7 target datasheet entry; Section1
Plate Supply Voltage
150 V
Published in approved 6BZ7 target datasheet entry; Section1
Cathode-Bias Resistor
220 Ω
Published in approved 6BZ7 target datasheet entry; Section1
Plate Resistance (Approx.)
5900 Ω
Published in approved 6BZ7 target datasheet entry; Section1
Transconductance
6400 µS
Published in approved 6BZ7 target datasheet entry; Section1
Plate Current
9 mA
Published in approved 6BZ7 target datasheet entry; Section1
Grid-Circuit Resistance
0.5 MΩ
Published in approved 6BZ7 target datasheet entry; Section1
* Rating may be high as
300 V
Published in approved 6BZ7 target datasheet entry; Section1

Capacitance

Grid to Plate 1.2
1.2 pF
Published in approved 6BZ7 target datasheet entry; Section1
—
-5 pF
Published in approved 6BZ7 target datasheet entry; Section1
Plate to Grid, Heater, and Internal Shield
2.2 pF
Published in approved 6BZ7 target datasheet entry; Section1
Plate to Cathode 0.12
0.12 pF
Published in approved 6BZ7 target datasheet entry; Section1
Heater to Cathode 2.6
2.6 pF
Published in approved 6BZ7 target datasheet entry; Section1
* Rating: may be high as
300 V
Published in approved 6BZ7 target datasheet entry; Section1

Characteristic

For plate current of 100
-6.5 V
Published in approved 6BZ7 target datasheet entry; Section1