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Voltage - Dual Triode (similar) ·Triode-Triode

12AY7

Medium-high-mu twin triode designed especially for low-noise voltage amplification, widely suited to low-level audio and other resistance-coupled amplifier stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
9A
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 150 mA

Description

Miniature type used in the first stages of high-gain Gi--^^© audio-frequency amplifiers. Outlines section, 6B; re- ,,! g|b. Uj?f Tl quires miniature 9-contact socket. Each triode unit is ~j|r" "jT independent of the other except for the common heater. cy^^~y^/®KT\ Use of the 12.6-volt connection with an ac heater sup- rS^JZZ& ply is not recommended for applications involving low PT 2 Hm hum. For typical operation as a resistance-coupled am- 9A plifier, refer to Resistance-Coupled Amplifier section. Heater Arrangement: Series Parallel

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

9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN12PBP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN22G1BG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN32KBK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN4H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN5H—H — Heater

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN61PAP — Plate (Anode)

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN71G1AG1 — Control Grid

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN81KAK — Cathode

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

PIN9HCT—HCT — Heater Center Tap

EIA transcription; manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 130, 9A

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
25000 Ω
Transconductance
0.00175 S
Amplification factor
44
Max plate voltage
300 V
Max plate dissipation
1.5 W
Max cathode current
10 mA

Each identical triode section.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
25000 Ω
Transconductance
0.00175 S
Amplification factor
44
Max plate voltage
300 V
Max plate dissipation
1.5 W
Max cathode current
10 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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate Voltage

    250 V

Characteristic

  • Plate Current

    3 mA

Data set 02

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • GRID TO PLATE; (G TO P)

    1.3 pF

    Published datasheet

  • INPUT: G TO (H}K)

    1.3 pF

    Published datasheet

Characteristic

  • HEATER VOLTAGE

    12.6 V

    Published datasheet; operating column 1

  • HEATER VOLTAGE

    6.3 V

    Published datasheet; operating column 2

  • HEATER CURRENT

    150 mA

    Published datasheet; operating column 1

  • HEATER CURRENT

    300 mA

    Published datasheet; operating column 2

  • PLATE VOLTAGE

    250 V

    Published datasheet

  • GRID VOLTAGE

    -4 V

    Published datasheet

  • PLATE CURRENT

    3 mA

    Published datasheet

  • PLATE RESISTANCE (APPROX.)

    25 ohm

    Published datasheet; operating column 1

  • PLATE RESISTANCE (APPROX.)

    0 ohm

    Published datasheet; operating column 2

  • Plate resistance

    25000 ohm

    Published datasheet; promoted section value

  • Transconductance

    0.00175 A/V

    Published datasheet; promoted section value

  • Amplification factor

    44

    Published datasheet; promoted section value

Other

  • MAXIMUM DC HEATER-CATHODE VOE TA GE

    90 V

    Published datasheet

  • MAXIMUM PLATE DISSIPATION

    1.5 W

    Published datasheet

  • MAXIMUM CATHODE CURRENT

    10 mA

    Published datasheet

  • HEATER SUPPLY VOI TAGE

    150 V

    Published datasheet

  • PLATE LOAD RESISTOR

    20 ohm

    Published datasheet; operating column 1

  • PLATE LOAD RESISTOR

    0 ohm

    Published datasheet; operating column 2

  • CATHODE RESISTOR

    2 ohm

    Published datasheet; operating column 1

  • CATHODE RESISTOR

    700 ohm

    Published datasheet; operating column 2

  • CATHODE RESISTOR

    0 ohm

    Published datasheet; operating column 3

Data set 03

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Plate Voltage

    250 V

    EachSection

  • Amplification Factor

    44

    EachSection

  • Plate Resistance

    25000 ohm

    EachSection

  • Transconductance

    1760 uS

    EachSection

Other

  • DC Cathode Current

    10 mA

    EachSection

Data set 04

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater voltage series

    12.6 V

    SeriesHeater

  • Heater current series

    150 mA

    SeriesHeater

  • Heater voltage parallel

    6.3 V

    ParallelHeater

  • Heater current parallel

    300 mA

    ParallelHeater

  • Plate voltage

    250 V

    ClassA1

  • Grid voltage

    -4 V

    ClassA1

  • Amplification factor

    40

    ClassA1

  • Plate resistance

    22800 ohm

    ClassA1

  • Transconductance

    1750 µS

    ClassA1

  • Plate current

    3 mA

    ClassA1

  • Grid voltage at plate current 10 µA

    -11 V

    ClassA1

Other

  • Maximum plate voltage

    300 V

    ClassA1

  • Maximum negative grid bias

    50 V

    ClassA1

  • Maximum plate dissipation

    1.5 W

    ClassA1

  • Maximum cathode current

    10 mA

    ClassA1

  • Peak heater-cathode voltage

    90 V

Capacitance

  • Grid-to-plate capacitance

    1.3 pF

  • Input capacitance

    1.3 pF

  • Output capacitance

    0.6 pF

Data set 05

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • connection),

    6.3 volts

    Published value from supplied target entry

  • 9A plifier, refer to Resistance-Coupled Amplifier section.

    9

    Published value from supplied target entry

  • Heater Voltage (ac/dc)

    6.3 volts

    Published value from supplied target entry

  • Heater Current

    0.3 ampere

    Published value from supplied target entry

  • Plate Voltage

    300 volts

    Published value from supplied target entry

  • Cathode Current

    10 mA

    Published value from supplied target entry

  • Plate Dissipation

    1.5 watts

    Published value from supplied target entry

  • Plate Voltage

    250 volts

    Published value from supplied target entry

  • Plate Resistance

    22800 ohms

    Published value from supplied target entry

  • Transconductance

    1750

    Published value from supplied target entry

  • Plate Current

    3 mA

    Published value from supplied target entry

  • Grid Voltage (Approx.) for plate current of

    11 mA

    Published value from supplied target entry

Capacitance

  • 100-^F capacitor ; grid resistor, 0 ohms ; and amplifier covering frequency range between

    0 ohms

    Published value from supplied target entry

  • Grid to Plate

    1.3 pF

    Published value from supplied target entry

  • Grid to Cathode and Heater

    1.3 pF

    Published value from supplied target entry

  • Plate to Cathode and Heater

    0.6 pF

    Published value from supplied target entry

Other

  • PT

    2

    Published value from supplied target entry

  • Peak Heater-Cathode Voltage ±

    90 volts

    Published value from supplied target entry

Data set 06

2026 JJ Electronic

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Ua

    250 V

    Published value

  • Ia

    3 mA

    Published value

  • f µ

    40

    Published value

  • Ua

    300 V

    Published value

  • Ug

    -50 V

    Published value

  • Wa

    1.5 W

    Published value

  • Ik

    10 mA

    Published value

Capacitance

  • cg/k

    1.6

    Published value

  • ca

    0.33

    Published value

  • cg/a

    1.7

    Published value