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Voltage Radio Detector Converter ·Pentode

5725

Ruggedized dual-control variable-mu pentode for mixer, controlled-amplifier, and specialized RF circuits. Independent control grids permit frequency conversion, gating, and gain-control functions, while extensive heater-cycling capability reflects demanding military and industrial service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater
6.3 V / 175 mA

Description

Ruggedized variable-mu pentode with two control grids for mixer and controlled-amplifier circuits.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater voltage
6.3 V
Nominal heater current
175 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E7-1 - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
250000 Ω
Transconductance
0.0032 S
Max plate voltage
180 V
Max screen voltage
140 V
Max plate dissipation
1.7 W
Max screen dissipation
0.75 W
Max cathode current
18 mA
Rectifier max heater-cathode voltage
90 V

Grid-No.1 transconductance promoted; Grid-No.3 transconductance preserved as a 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

1958 Compagnie General

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Grid 1 Transconductance

    3200 uS

  • Grid 3 Transconductance

    470 uS

  • Application

    Frequency converter / variable gain / modulator / gate

Other

  • Plate Dissipation

    1.65 W

Data set 02

1960 RCA Industrial and Communications Types

Published operating points and test conditions from this source.

SECTION 1

Pentode

CrossReference

  • Prototype / equivalent family

    6AS6

Data set 03

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    6.3 V

  • Heater current

    175 mA

  • Maximum grid 3 voltage

    30 V

  • Plate voltage

    120 V

  • Grid 3 voltage

    0 V

  • Screen voltage

    120 V

  • Grid 1 voltage

    -2 V

  • Plate current

    5.2 mA

  • Screen current

    3.5 mA

  • Maximum plate voltage

    200 V

  • Maximum screen voltage

    155 V

  • Maximum plate dissipation

    1.65 W

  • Maximum screen dissipation

    0.55 W

  • Maximum cathode current

    20 mA

Characteristic

  • Grid1-to-plate transconductance

    3200 uS

  • Grid3-to-plate transconductance

    470 uS

Capacitance

  • Grid1-to-plate capacitance maximum

    0.025 pF

  • Input capacitance

    3.9 pF

  • Output capacitance

    2.2 pF

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Grid Number 3 Voltage Maximum

    27 V

  • Plate Voltage

    120 V

    TypicalOperation

  • Screen Voltage

    120 V

    TypicalOperation

Characteristic

  • Plate Current

    5.2 mA

    TypicalOperation

  • Grid Number 3 Transconductance

    470 uS

    TypicalOperation

  • Heater Cycling Minimum

    5000 cycles

Data set 05

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Application

  • Application

    Mixer_ControlledAmplifier text

Data set 06

1971 RCA HB3 Binder 3 of 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Maximum plate voltage

    - to 200 V

  • Maximum screen voltage

    - to 155 V

  • Maximum plate dissipation

    - to 1.65 W

  • Maximum screen dissipation

    - to 0.55 W

  • Maximum cathode current

    - to 20 mA

Characteristics

  • Transconductance

    3200 µS

  • Plate voltage

    120 V

    ClassA

  • Grid No.3 voltage

    0 V

    ClassA

  • Grid No.2 voltage

    120 V

    ClassA

  • Grid No.1 voltage

    -2 V

    ClassA

  • Transconductance grid No.1 to plate

    3200 µS

    ClassA

  • Transconductance grid No.3 to plate

    470 µS

    ClassA

  • Plate current

    5.2 mA

    ClassA

  • Grid No.2 current

    3.5 mA

    ClassA

Data set 07

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    6.3 V

  • Heater current

    175 mA

  • Plate voltage

    120 V

  • Screen voltage

    120 V

  • Plate current

    5.2 mA

  • Screen current

    3.5 mA

  • Transconductance

    3200 uS

  • Plate resistance

    150000 ohm