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Power - Beam (NOT sweep) ·BeamPower

1Q5G

Low-drain battery beam-power amplifier designed for portable audio-output service, with published output around a quarter watt under typical operating conditions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
7
Nominal heater
1.4 V / 100 mA

Description

Sylvania 1Q5G is a low-drain battery directed-electron power amplifier with published output and distortion data.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
7
Nominal heater voltage
1.4 V
Nominal heater current
100 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

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
Transconductance
0.0022 S
Max plate voltage
110 V
Max screen voltage
110 V
Max cathode current
12 mA

Source-defined physical/function section.

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

1937 Ken Rad

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Characteristics

  • Plate Voltage

    80 V

    Plate Voltage 80 Volts

  • Screen Voltage

    90 V

    Screen Voltage 90 Volts

  • Grid Voltage

    -4.5 V

    Control Grid Voltage -4.5 Volts

  • Plate Current

    9.5 mA

    Plate Current 9.5 Milliamperes

  • Screen Current

    1.6 mA

    Screen Current 1.6 Milliamperes

  • Mutual Conductance

    2100 µS

    Mutual Conductance 2,100 Micromhos

  • Load Resistance

    8000 ohm

    Load Resistance 8,000 Ohms

Other

  • Filament voltage

    1.4 V

    Published filament rating

  • Filament current

    100 mA

    Published filament rating

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • Plate Voltage

    85 V

    Cond1

  • Plate Voltage

    90 V

    Cond2 max

  • Plate Current

    8.2 mA

    Cond1

  • Plate Current

    9.5 mA

    Cond2

  • Load Impedance

    8000 ohm

  • Power Output

    225 mW

    Cond1

  • Power Output

    270 mW

    Cond2

  • Total Harmonic Distortion

    9 %

    Cond1

  • Total Harmonic Distortion

    7.5 %

    Cond2

Characteristic

  • Transconductance

    1950 µS

    Cond1

  • Transconductance

    2100 µS

    Cond2