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Voltage Pentode - Sharp Cutoff (single) ·Pentode

12DQ7

Sharp-cutoff television video-amplifier pentode in the 12BY7A/12BV7/12DQ7 replacement family. Its high-frequency wideband characteristics make it a fixed-gain video signal tube rather than a conventional power pentode.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9BF
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 300 mA

Description

Sharp-cutoff pentode used as a television video amplifier; 12BY7A, 12BV7, and 12DQ7 are handled as the source-stated replacement family.

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
9BF
Socket code
B9A
Base pins
9
Nominal heater voltage
12.6 V
Nominal heater current
300 mA
Parallel heater voltage
6.3 V
Parallel heater current
600 mA
Series capable
Yes

9BF - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1KAK — Cathode

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN2G1AG1 — Control Grid

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN3G3AG3 — Suppressor Grid

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN4H—H — Heater

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN5H—H — Heater

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN6HCT—HCT — Heater Center Tap

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN7PAP — Plate (Anode)

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN8G2AG2 — Screen Grid

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

PIN9G3AG3 — Suppressor Grid

EIA chart transcription; manufacturer corroboration pending

Unverified

EIA Base Connections, printed page 131, 9BF

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
53000 Ω
Transconductance
0.0105 S
Max plate voltage
330 V
Max screen voltage
330 V
Max plate dissipation
6.5 W
Max screen dissipation
1.1 W

Promoted from published ratings/characteristics where directly applicable; additional published values retained in TUBE_SECTION_PARAMETER.

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

  • Service

    Video output amplifier

  • Heater Warmup Time

    11 s

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Current

    26 mA

    ClassA

  • Screen Current

    5.6 mA

    ClassA

Data set 03

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage (ac/dc) 12.6

    6.3 V

    Published in approved 12DQ7 target entry; Section1

  • Heater Current 0.3

    600 mA

    Published in approved 12DQ7 target entry; Section1

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 12DQ7 target entry; Section1

  • Plate Supply Voltage

    330 V

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.3 (Suppressor-Grid) Voltage, Positive value

    0 V

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage

    190 V

    Published in approved 12DQ7 target entry; Section1

  • Negative-bias value

    65 V

    Published in approved 12DQ7 target entry; Section1

  • Positive-bias value

    0 V

    Published in approved 12DQ7 target entry; Section1

  • Plate Dissipation

    6.5 W

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.2 Input

    1.2 W

    Published in approved 12DQ7 target entry; Section1

  • grid-no

    2 V

    Published in approved 12DQ7 target entry; Section1

  • For fixed-bias operation

    0.25 MΩ

    Published in approved 12DQ7 target entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved 12DQ7 target entry; Section1

  • Heater Voltage (ac/dc) 6.3 16.8

    25.3 V

    Published in approved 12DQ7 target entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved 12DQ7 target entry; Section1

  • Heater Warm-up Time {Average) 11 11

    11 seconds

    Published in approved 12DQ7 target entry; Section1

  • Peak Inverse Plate Voltage*

    5000 V

    Published in approved 12DQ7 target entry; Section1

  • Peak Plate Current

    1200 mA

    Published in approved 12DQ7 target entry; Section1

  • Average Plate Current

    250 mA

    Published in approved 12DQ7 target entry; Section1

  • Plate Dissipation

    4.75 W

    Published in approved 12DQ7 target entry; Section1

  • Peak value +800

    -5000 V

    Published in approved 12DQ7 target entry; Section1

  • Average value -(-100

    -900 V

    Published in approved 12DQ7 target entry; Section1

Capacitance

  • Grid No.l to Plate

    0.063 pF

    Published in approved 12DQ7 target entry; Section1

  • and Internal Shield

    10.2 pF

    Published in approved 12DQ7 target entry; Section1

  • Plate to Cathode, Heater, Grid No.2, and Internal Shield

    3.5 pF

    Published in approved 12DQ7 target entry; Section1

  • Plate to Cathode and Heater

    12 pF

    Published in approved 12DQ7 target entry; Section1

  • Cathode to Plate and Heater

    9.5 pF

    Published in approved 12DQ7 target entry; Section1

  • Heater to Cathode

    2.8 pF

    Published in approved 12DQ7 target entry; Section1

Characteristic

  • Plate Supply Voltage

    250 V

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.2 Supply Voltage

    180 V

    Published in approved 12DQ7 target entry; Section1

  • Cathode-Bias Resistor

    100 Ω

    Published in approved 12DQ7 target entry; Section1

  • Plate Resistance (Approx.)

    93000 Ω

    Published in approved 12DQ7 target entry; Section1

  • Plate Current

    26 mA

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.2 Current B

    75 mA

    Published in approved 12DQ7 target entry; Section1

  • Grid-No.l Voltage (Approx.) for plate current of 20 jtA

    11.6 V

    Published in approved 12DQ7 target entry; Section1