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

5BQ7A

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

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9AJ
Socket code
B9A
Base pins
9
Nominal heater
5.6 V / 450 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
5.6 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9AJ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12PBP — Plate (Anode)

Numbered source electrode preserved; manufacturer verification pending

Unverified

EIA Base Connections, printed page 131, 9AJ

PIN22G1BG1 — Control Grid

Source label preserved; pending confirmation

Unverified

EIA Base Connections, printed page 131, 9AJ

PIN32KBK — 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

PIN61PAP — Plate (Anode)

Numbered source electrode preserved; manufacturer verification pending

Unverified

EIA Base Connections, printed page 131, 9AJ

PIN71G1AG1 — Control Grid

Source label preserved; pending confirmation

Unverified

EIA Base Connections, printed page 131, 9AJ

PIN81KAK — Cathode

Numbered source electrode preserved; manufacturer verification pending

Unverified

EIA Base Connections, printed page 131, 9AJ

PIN9ISAIS — 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
300 V
Max plate dissipation
1.5 W
Max cathode current
20 mA
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Referenced ratings not printed in this source; not inferred.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
6100 Ω
Transconductance
0.0064 S
Amplification factor
39
Max plate voltage
300 V
Max plate dissipation
1.5 W
Max cathode current
20 mA

Second physical triode section; electrically identical twin 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

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater/filament voltage

    5.6 V

    Published rating

  • Heater/filament current

    450 mA

    Published rating

Capacitance

  • Grid-to-plate capacitance

    1.15 pF

    EachSection

  • Input capacitance

    2.85 pF

    Section1

  • Grounded-grid input capacitance

    4.35 pF

    Section2

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Warmup Time

    11 s

Data set 03

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate voltage

    150 V

    ClassA;EachSection

  • Grid voltage

    -2 V

    ClassA;EachSection

  • Plate current

    9 mA

    ClassA;EachSection

  • Maximum plate voltage

    300 V

    EachSection

  • Maximum plate dissipation

    1.5 W

    EachSection

  • Heater/filament voltage

    5.6 V

    DerivativeSheet

  • Heater/filament current

    450 mA

    DerivativeSheet

  • Heater warm-up time

    11 s

    ControlledWarmup

Characteristic

  • Plate resistance

    6100 ohm

    EachSection

  • Transconductance

    6400 uS

    EachSection

  • Amplification factor

    39

    EachSection

Capacitance

  • Grid-to-plate capacitance

    1.15 pF

    EachSection

  • Grid-to-cathode capacitance

    2.85 pF

    EachSection

  • Plate-to-cathode capacitance

    0.15 pF

    EachSection

Data set 04

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