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Voltage Pentode - Sharp Cutoff (single) ·Pentode

12BY7A

Sharp-cutoff pentode designed for television video amplification. It belongs to the 12BY7A/12BV7/12DQ7 replacement family and provides high-transconductance wideband signal gain rather than ordinary audio power output.

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
93000 Ω
Transconductance
0.011 S
Max plate voltage
300 V
Max screen voltage
180 V
Max plate dissipation
6.5 W
Max screen dissipation
1.1 W

Promoted values are limited to values explicitly present in this supplied 12-V datasheet block; additional published values are retained in parameter rows.

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

  • Heater voltage

    12.6 V

    Nominal

  • Heater current

    300 mA

    Nominal

  • Plate voltage

    250 V

    Typical operating conditions

  • Screen voltage

    180 V

    Typical operating conditions

  • Plate current

    26 mA

    Typical operating conditions

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Series heater voltage

    12.6 V

    SeriesHeater

  • Series heater current

    300 mA

    SeriesHeater

  • Parallel heater voltage

    6.3 V

    ParallelHeater

  • Parallel heater current

    600 mA

    ParallelHeater

  • Transconductance

    11000 uS

  • Plate resistance

    93000 ohm

Other

  • Typical plate voltage

    250 V

  • Heater-cathode voltage maximum

    200 V

Application

  • Application

    Video amplifier

Capacitance

  • Grid-to-plate capacitance

    0.063 pF

  • Input capacitance

    10.2 pF

  • Output capacitance

    3.5 pF

Data set 03

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • GRID #1 TO PLATE: G1 TO P

    0.063 pF

    Published datasheet

  • INPUT: G

    1 pF

    Published datasheet; operating column 1

  • INPUT: G

    15 pF

    Published datasheet; operating column 2

  • INPUT: G

    10.2 pF

    Published datasheet; operating column 3

Other

  • TOTAL DC AND PEAK

    200 V

    Published datasheet

  • MAXIMUM PLATE SUPPLY VOLTAGE ---►

    3 V

    Published datasheet

  • MAXIMUM NEGATIVE

    0 V

    Published datasheet; operating column 1

  • MAXIMUM NEGATIVE

    55 V

    Published datasheet; operating column 2

  • MAXIMUM POSITIVE DC GRID #1 VOLTAGE

    0 V

    Published datasheet

  • MAXIMUM GRID #2 VOLTAGE —i

    190 V

    Published datasheet

  • MAXIMUNA PLATE DISSIPATION —►

    6.5 W

    Published datasheet

  • MAXIMUM GRID #2 DISSIPATION --►

    1.2 W

    Published datasheet

  • MAXIMUM GRID #1 CIRCUIT RESISTANCE

    0 Mohm

    Published datasheet

  • MA FIXED BIAS

    0 Mohm

    Published datasheet; operating column 1

  • MA FIXED BIAS

    0.25 Mohm

    Published datasheet; operating column 2

  • CATHODE BIAS

    0 Mohm

    Published datasheet; operating column 1

  • CATHODE BIAS

    1 Mohm

    Published datasheet; operating column 2

  • HEATER WARM— UP TIME ~APPROX.)

    11 s

    Published datasheet

  • CATHODE RESISTOR

    100 ohm

    Published datasheet; operating column 1

  • CATHODE RESISTOR

    0 ohm

    Published datasheet; operating column 2

Characteristic

  • PLATE VOLTAGE

    250 V

    Published datasheet

  • GRID #2 VOLTAGE

    180 V

    Published datasheet

  • PLATE CURRENT

    26 mA

    Published datasheet

  • GRID #2 CURRENT

    5.7 mA

    Published datasheet

  • PLATE RESISTANCE

    93 ohm

    Published datasheet; operating column 1

  • PLATE RESISTANCE

    0 ohm

    Published datasheet; operating column 2

  • TRANSCONDUCTANCE

    11 uS

    Published datasheet; operating column 1

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Current

    26 mA

    ClassA

  • Screen Current

    5.75 mA

    ClassA

Data set 05

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Voltage (AC or DC) — published value 1

    12.6 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Voltage (AC or DC) — published value 2

    10 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Voltage (AC or DC) — published value 3

    6.3 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Current — published value 1

    4.3 A

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Current — published value 2

    600 mA

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Current — published value 3

    6 A

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Grid No.l to plate

    0.063

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • and heater

    10.2

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • and heater

    3.5

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Plate Supply Voltage

    250 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Grid-No.2 Supply Voltage

    180 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Cathode Resistor

    100 ohm

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Plate Resistance (Approx )

    93000 ohm

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Transconductance

    11000

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Plate Current

    26 mA

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Grid-No.2 Current

    5.75 mA

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • plate µa = 20 — published value 1

    20 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • plate µa = 20 — published value 2

    -11.6 V

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 1 -Cathode — published value 1

    1

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 1 -Cathode — published value 2

    6

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 2 -Grid No.l — published value 1

    2

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 2 -Grid No.l — published value 2

    7

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 3 -Grid No.3, — published value 1

    3

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 3 -Grid No.3, — published value 2

    8

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Internal

    9

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 4 -Heater

    4

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

  • Pin 5 -Heater

    5

    Published value from the filename-designated RCA datasheet block; multiple numbers on one row represent separate limits or heater arrangements.

Data set 06

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 12BY7A target entry; Section1

  • Heater Current 0.3

    600 mA

    Published in approved 12BY7A target entry; Section1

  • Heater Warm-up Time (Average)

    11 seconds

    Published in approved 12BY7A target entry; Section1

  • Plate Supply Voltage

    330 V

    Published in approved 12BY7A target entry; Section1

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

    0 V

    Published in approved 12BY7A target entry; Section1

  • Grid-No.2 (Screen-Grid) Voltage

    190 V

    Published in approved 12BY7A target entry; Section1

  • Negative-bias value

    65 V

    Published in approved 12BY7A target entry; Section1

  • Positive-bias value

    0 V

    Published in approved 12BY7A target entry; Section1

  • Plate Dissipation

    6.5 W

    Published in approved 12BY7A target entry; Section1

  • Grid-No.2 Input

    1.2 W

    Published in approved 12BY7A target entry; Section1

  • grid-no

    2 V

    Published in approved 12BY7A target entry; Section1

  • For fixed-bias operation

    0.25 MΩ

    Published in approved 12BY7A target entry; Section1

  • For cathode-bias operation

    1 MΩ

    Published in approved 12BY7A target entry; Section1

  • Heater Voltage (ac/dc) 6.3 16.8

    25.3 V

    Published in approved 12BY7A target entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved 12BY7A target entry; Section1

  • Heater Warm-up Time {Average) 11 11

    11 seconds

    Published in approved 12BY7A target entry; Section1

Capacitance

  • Grid No.l to Plate

    0.063 pF

    Published in approved 12BY7A target entry; Section1

  • and Internal Shield

    10.2 pF

    Published in approved 12BY7A target entry; Section1

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

    3.5 pF

    Published in approved 12BY7A target entry; Section1

  • Plate to Cathode and Heater

    12 pF

    Published in approved 12BY7A target entry; Section1

Characteristic

  • Plate Supply Voltage

    250 V

    Published in approved 12BY7A target entry; Section1

  • Grid-No.2 Supply Voltage

    180 V

    Published in approved 12BY7A target entry; Section1

  • Cathode-Bias Resistor

    100 Ω

    Published in approved 12BY7A target entry; Section1

  • Plate Resistance (Approx.)

    93000 Ω

    Published in approved 12BY7A target entry; Section1

  • Plate Current

    26 mA

    Published in approved 12BY7A target entry; Section1

  • Grid-No.2 Current B

    75 mA

    Published in approved 12BY7A target entry; Section1

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

    11.6 V

    Published in approved 12BY7A target entry; Section1