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Power - Beam (NOT sweep) ·BeamPower-Rectifier

32L7GT

Combination AC/DC receiver tube integrating a half-wave rectifier with a beam-power audio-output section, allowing power-supply rectification and loudspeaker amplification in one envelope.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
8Z
Socket code
IO
Base pins
8
Nominal heater
32.5 V / 300 mA

Description

Combined tetrode and rectifier for A.C./D.C. receiver service.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
8Z
Socket code
IO
Base pins
8
Nominal heater voltage
32.5 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

8Z - 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

Rectifier

X-ray radiationInterelectrode capacitances
Rectifier peak inverse voltage
1250 V
Rectifier nominal output current
60 mA

AC plate supply RMS 126 V.

Section 2

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
15000 Ω
Transconductance
0.006 S
Amplification factor
90
Max plate voltage
90 V
Max screen voltage
90 V

Class-A typical; alternate Rp 17k, gm 4.8mS.

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

1939 Arcturus

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • AC plate voltage

    125 V

  • DC output current

    60 mA

SECTION 2

Beam Power

Other

  • Plate voltage

    90 V

  • Screen-grid voltage

    90 V

  • Control-grid voltage

    -7 V

  • Plate current

    27 mA

  • Screen-grid current

    2 mA

  • Load resistance

    2600 ohm

  • Power output

    1 W

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • DC output current maximum

    60 mA

    HalfWave

  • RMS supply voltage maximum

    125 V

    HalfWave

SECTION 2

Beam Power

Other

  • Plate voltage

    90 V

    ClassA

  • Screen voltage

    90 V

    ClassA

  • Control-grid voltage

    -7 V

    ClassA

  • Plate current

    27 mA

    ClassA

  • Screen current

    2 mA

    ClassA

  • Load resistance

    2600 Ω

    ClassA

  • Power output

    1 W

    ClassA

  • Plate voltage

    90 V

    ClassA

  • Screen voltage

    90 V

    ClassA

  • Control-grid voltage

    -5 V

    ClassA

  • Plate current

    38 mA

    ClassA

  • Screen current

    3 mA

    ClassA

  • Load resistance

    2600 Ω

    ClassA

  • Power output

    0.8 W

    ClassA

Characteristic

  • Plate resistance

    17000 Ω

    ClassA

  • Transconductance

    4800 µS

    ClassA

  • Plate resistance

    15000 Ω

    ClassA

  • Transconductance

    6000 µS

    ClassA

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • AC Plate Voltage

    125 V

    Section1;Rectifier

  • DC Output Current

    60 mA

    Section1;Rectifier

SECTION 2

Beam Power

Characteristic

  • Plate Resistance

    15000 ohm

    Section2;PlateVoltage=50V

  • Transconductance

    6800 uS

    Section2;PlateVoltage=50V

Other

  • Power Output

    1 W

    Section2;PlateVoltage=90V

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Rectifier

Other

  • AC Plate Supply Voltage RMS

    126 V

    RectifierSection

SECTION 2

Beam Power

Other

  • Plate Voltage

    90 V

    ClassA

  • Screen Voltage

    90 V

    ClassA

  • Plate Current

    38 mA

    ClassA

  • Maximum-Signal Power Output

    0.8 W

    ClassA