Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Diode (NOT rectifier) ·Diode-Diode

3AL5

High-perveance twin diode intended especially for FM and television detection, including balanced ratio-detector circuits and related discriminator service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater
3.15 V / 600 mA

Description

High-perveance twin diode used as an FM/television detector, especially in ratio-detector 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
3.15 V
Nominal heater current
600 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

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
330 V
Rectifier nominal output current
9 mA
Rectifier peak forward current
54 mA
Rectifier forward voltage drop
10 V
Rectifier max heater-cathode voltage
200 V
Rectifier warm-up time
11 s

Representative of both identical diode sections; half-wave rectifier values are per plate.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings, characteristics, operating points and capacitances reviewed.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Peak inverse voltage

    330 V

    Published rectifier service

  • DC output current

    9 mA

    Published rectifier service

  • Peak current

    54 mA

    Published rectifier service

  • RMS supply voltage

    117 V

    Published rectifier service

Characteristic

  • Tube voltage drop

    10 V

    At 60 mA DC

  • Heater/filament voltage

    3.15 V

    Published heater/filament rating

  • Heater/filament current

    600 mA

    Published heater/filament rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • AC plate voltage RMS each plate

    117 V

    EachPlate

  • Steady-state peak plate current each plate

    5 mA

    EachPlate

  • DC output current each plate

    9 mA

    EachPlate

Characteristic

  • Average diode current each unit

    60 mA

    110VDC

  • Resonant frequency each unit

    700 MHz

    Approximate

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

  • Heater Voltage

    3.15 V

  • Heater Current

    600 mA

  • ControlledWarmupHeater

    1 boolean

  • Heater Warmup Time

    11 s

  • ResonantFrequencyApproximate

    700 MHz

  • Plate To Cathode Capacitance

    3.2 pF

  • CathodeToPlateCapacitance

    3.6 pF

Other

  • PeakInverseVoltageMaximum

    330 V

    EachDiode

  • PeakPlateCurrentMaximum

    54 mA

    EachDiode

  • DCOutputCurrentMaximum

    9 mA

    EachDiode

  • ACVoltagePerPlateRMS

    117 V

    HalfWaveRectifier

  • MinimumPlateSupplyImpedance

    300 ohm

    EachPlate

Data set 04

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

  • Heater voltage

    3.15 V

    Published heater rating

  • Heater current

    600 mA

    Published heater rating

Other

  • Maximum peak inverse voltage

    330 V

    EachDiode

  • Maximum AC plate voltage

    117 V RMS

    EachDiode

  • Maximum steady-state peak plate current

    50 mA

    EachDiode

Capacitance

  • Plate input capacitance

    2.5 pF

    EachDiode

  • Inter-section coupling capacitance

    0.068 pF

    WithoutShield

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • HeaterOrFilamentVoltageNominal

    3.15 V

  • HeaterOrFilamentCurrentNominal

    600 mA

  • Maximum Peak Inverse Voltage

    330 V

  • NominalDCOutputCurrent

    9 mA

  • PeakForwardCurrent

    54 mA

  • Maximum Heater Cathode Voltage

    200 V

  • ACPlateSupplyVoltagePerPlateRMS

    117 V

    HalfWave

Characteristic

  • Forward Voltage Drop

    10 V

Capacitance

  • Plate To Cathode Heater Shield Capacitance

    3.2 pF

Data set 06

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

  • Current — published value 1

    450 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    30 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (AC or DC) at heater — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (AC or DC) at heater — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 1

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    600 A

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 3

    40 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

Data set 07

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

  • Heater Voltage (ac/dc) 3.15 6.3

    12.6 V

    Heater Voltage (ac/dc) 3.15 6.3 12.6 volts

  • Peak Inverse Plate Voltage

    330 V

    Peak Inverse Plate Voltage 330 volts

  • Peak Plate Current (Per Plate)

    54 mA

    Peak Plate Current (Per Plate) 54 mA

  • AC Plate Voltage per Plate (rms)

    117 V

    AC Plate Voltage per Plate (rms) 117 volts

  • Average Output Current per Plate

    9 mA

    Average Output Current per Plate 9 mA

  • Heater Voltage (ac/dc) 6.3 9.8

    12.6 V

    Heater Voltage (ac/dc) 6.3 9.8 12.6 volts

  • Heater Current 0.9 0.6

    450 mA

    Heater Current 0.9 0.6 0.45 ampere

  • Heater Warm-up Time (Average) — 11

    11 s

    Heater Warm-up Time (Average) — 11 11 seconds

  • Peak plate current

    54 mA

    Published rectifier rating

  • Average output/plate current

    9 mA

    Published rectifier operating/rating value