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Power - Beam (NOT sweep) ·BeamPower

3B5GT

Low-voltage beam-power amplifier with a 1.4-volt filament, intended for battery-operated receiver power-output service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
7AQ
Socket code
-
Base pins
8
Nominal heater
2.8 V / 220 mA

Description

3B5GT is listed in the supplied receiving-tube handbook as a beam-power amplifier. The published heater/filament rating is 1.4 V at 0.1 A.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
7AQ
Socket code
-
Base pins
8
Nominal heater voltage
2.8 V
Nominal heater current
220 mA
Parallel heater voltage
1.4 V
Parallel heater current
440 mA
Series capable
Yes

7AQ - 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

Beam Power

X-ray radiationInterelectrode capacitances
Plate resistance
100000 Ω
Transconductance
0.00165 S
Max plate voltage
67.5 V
Max screen voltage
67.5 V
Max cathode current
12 mA

Published ratings/characteristics promoted where semantically applicable; supplemental values retained in parameter table.

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

Beam Power

Other

  • Maximum plate voltage

    67.5 V

    Published handbook rating

  • Maximum screen voltage

    67.5 V

    Published handbook rating

  • Plate voltage

    67.5 V

    ClassA

  • Screen voltage

    67.5 V

    ClassA

  • Control-grid bias

    7 V

    ClassA

  • Plate current

    8 mA

    ClassA

  • Screen current

    0.6 mA

    ClassA

  • Load resistance

    5000 ohm

    ClassA

  • Power output

    0.2 W

    ClassA

Characteristic

  • Plate resistance

    100000 ohm

    Published handbook characteristic

  • Transconductance

    1650 µS

    Published handbook characteristic

  • Heater/filament voltage

    1.4 V

    Published heater/filament rating

  • Heater/filament current

    100 mA

    Published heater/filament rating

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Heater Voltage Series

    2.8 V

    SeriesFilaments

  • Heater Voltage Parallel

    1.4 V

    ParallelFilaments