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GL2H21

Phasitron phase-modulator tube for FM transmitters, designed to introduce wide audio-frequency phase excursions into a crystal-controlled radio-frequency carrier.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

The GL-2H21 is a phase-modulator tube for FM transmitters, intended to introduce wide phase excursions at audio-frequency rates into a crystal-controlled radio-frequency carrier.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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 0

Other

X-ray radiationInterelectrode capacitances

Max plate voltage: 300 V
Max cathode current: 6 mA

Phasitron phase-modulator section; plate maximum and cathode-current maximum promoted.

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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 0

Other

Plate No.1 Voltage Maximum
300 V
Plate No.2 Voltage Maximum
300 V
Deflector Voltage Maximum
100 V
Grid No.1 Voltage Maximum
25 V

Characteristic

Typical RF Output Voltage
4 V rms
PhaseModulator
Audio Modulating Power for 180 Degree Phase Shift
50 mW
PhaseModulator