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Voltage Pentode - Remote Cutoff (single) ·Pentode

3EH7

Semi-remote-cutoff pentode designed as an IF amplifier in color and black-and-white television receivers. Its controlled transconductance supports AGC operation in wideband television intermediate-frequency stages.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
9AQ
Socket code
B9A
Base pins
9
Nominal heater
3.15 V / 600 mA

Description

Semiremote-cutoff pentode used as an IF-amplifier tube in color and black-and-white television receivers.

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
9AQ
Socket code
B9A
Base pins
9
Nominal heater voltage
3.15 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

9AQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

TerminalSectionConnectionEvidence
PIN1KAK — Cathode

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN2G1AG1 — Control Grid

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN3KAK — Cathode

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN4H—H — Heater

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN5H—H — Heater

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN6ISAIS — Internal Screen

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN7PAP — Plate (Anode)

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN8G2AG2 — Screen Grid

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

PIN9G3AG3 — Suppressor Grid

EIA chart transcription, manufacturer confirmation pending

Unverified

EIA Base Connections, printed page 131, 9AQ

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
500000 Ω
Transconductance
0.0125 S
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
2.5 W
Max screen dissipation
0.65 W
Max cathode current
20 mA
Rectifier max heater-cathode voltage
150 V

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

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage cut-off condition

    550 V

  • Screen voltage cut-off condition

    550 V

Characteristic

  • Input resistance at 40 Mc/s

    10000 ohm

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • INPUT: G4 TO (HtG2tGatkt1s)

    9.5 PF

    Published datasheet value

  • OUTPUT: P TO (HtG2tGeatktis)

    2.8 PF

    Published datasheet value

Other

  • PLATE VOLTAGE

    250 VOLTS

    Published datasheet value

  • CATHODE CURRENT

    20 MA

    Published datasheet value

  • PLATE VOLTAGE 200

    200 VOLTS

    Published datasheet value

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    IFAmplifier

  • Screen voltage

    90 V

    IFAmplifier

  • Control-grid voltage

    -2 V

    IFAmplifier

  • Plate current

    12 mA

    IFAmplifier

  • Screen current

    4.5 mA

    IFAmplifier

Characteristic

  • Plate resistance

    500000 Ω

    Section1

  • Transconductance

    12500 µS

    Section1

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    200 V

    IFAmplifier

  • Screen supply voltage

    90 V

    IFAmplifier

  • Grid-1 voltage

    -2 V

    IFAmplifier

  • Plate current

    12 mA

    IFAmplifier

  • Screen current

    4.5 mA

    IFAmplifier

Characteristic

  • Transconductance

    12500 µS

    Section1

  • Plate resistance

    0.5 MΩ

    Section1

  • Grid-1 impedance at 40 MHz

    13 kΩ

    Section1

  • Cutoff transconductance at -6.5 V

    1250 µS

    Section1

  • Cutoff transconductance at -9.5 V

    725 µS

    Section1

  • Cutoff transconductance at -19.5 V

    125 µS

    Section1

  • Heater warm-up time

    12 s

    Section1

Data set 05

1967 Mullard Receiving and Amplifying Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • I. 11.6 11.8 11 .7

    11.4 mA

    Published in approved EF183 target datasheet entry; Section1

  • Ig2 4.3 4.4 4.4

    4.3 mA

    Published in approved EF183 target datasheet entry; Section1

  • gm 12 .3 12.4 12 .2

    12 mA

    Published in approved EF183 target datasheet entry; Section1

  • Itota1 16 27 24

    21 mA

    Published in approved EF183 target datasheet entry; Section1

  • I. 11.8 11.9 12

    11.6 mA

    Published in approved EF183 target datasheet entry; Section1

  • Ig2 4.4 4.5 4.5

    4.4 mA

    Published in approved EF183 target datasheet entry; Section1

  • gm 12.3 12.5 12.5

    15.5 mA

    Published in approved EF183 target datasheet entry; Section1

  • ltotal 19.7 18 .5 14.7

    16 mA

    Published in approved EF183 target datasheet entry; Section1

  • la 11.7 12 11.8

    11.4 mA

    Published in approved EF183 target datasheet entry; Section1

  • Ig2 4.3 4.5 4.4

    4.3 mA

    Published in approved EF183 target datasheet entry; Section1

  • gm 12.4 13 12.3

    12 mA

    Published in approved EF183 target datasheet entry; Section1

  • Itotal 16 27 24

    21 mA

    Published in approved EF183 target datasheet entry; Section1

  • la 11.8 12

    12 mA

    Published in approved EF183 target datasheet entry; Section1

  • Ig2 4.4 4.5

    4.5 mA

    Published in approved EF183 target datasheet entry; Section1

  • gm 12 .4 12 .5 12

    5 mA

    Published in approved EF183 target datasheet entry; Section1

  • Ito'al 19.7 18.5

    17.5 mA

    Published in approved EF183 target datasheet entry; Section1

  • Pg2 max

    650 mW

    Published in approved EF183 target datasheet entry; Section1

  • Ik max

    20 mA

    Published in approved EF183 target datasheet entry; Section1

  • T bu1b max

    180 °C

    Published in approved EF183 target datasheet entry; Section1

Data set 06

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater Voltage (ac/dc) 3.4 4.4

    6.3 V

    Published in approved XF183 target datasheet entry; Section1

  • Heater Current 0.6 0.45

    300 mA

    Published in approved XF183 target datasheet entry; Section1

  • Plate Supply Voltage

    550 V

    Published in approved XF183 target datasheet entry; Section1

  • Plate Voltage

    250 V

    Published in approved XF183 target datasheet entry; Section1

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

    0 V

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 (Screen-Grid) Supply Voltage

    550 V

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Voltage

    250 V

    Published in approved XF183 target datasheet entry; Section1

  • Cathode Current

    20 mA

    Published in approved XF183 target datasheet entry; Section1

  • Plate Dissipation

    2.5 W

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Input

    0.65 W

    Published in approved XF183 target datasheet entry; Section1

  • Plate Voltage

    200 V

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Voltage

    90 V

    Published in approved XF183 target datasheet entry; Section1

  • Plate Voltage 200 200 200

    200 V

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Supply Voltage 200 200 200

    200 V

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Series Resistor 22000 22000 22000

    22000 Ω

    Published in approved XF183 target datasheet entry; Section1

  • Transconductance 125 625 1250

    12500 µS

    Published in approved XF183 target datasheet entry; Section1

  • cross-modulation factor of 0.01 450 160

    100 mV

    Published in approved XF183 target datasheet entry; Section1

Characteristic

  • Grid-No. 1 Voltage

    -2 V

    Published in approved XF183 target datasheet entry; Section1

  • Plate Resistance (Approx.)

    0.5 MΩ

    Published in approved XF183 target datasheet entry; Section1

  • Transconductance

    12500 µS

    Published in approved XF183 target datasheet entry; Section1

  • Plate Current

    12 mA

    Published in approved XF183 target datasheet entry; Section1

  • Grid-No.2 Current

    4.5 mA

    Published in approved XF183 target datasheet entry; Section1