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Tube Tinker — Electron Tube Database
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Power - Triode ·Triode

3T20

Small transmitting power triode intended for oscillator, RF power-amplifier, AF power-amplifier, and modulator service. Its published ratings cover both radio-frequency generation and audio/modulation duties.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
7.5 V / -

Description

Power triode for oscillator, RF power amplifier, AF power amplifier and modulator service.

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
7.5 V
Nominal heater current
-
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

Triode

X-ray radiationInterelectrode capacitances
Max plate dissipation
20 W

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid-anode capacitance

    6 pF

  • Grid-filament capacitance

    4.5 pF

  • Filament-anode capacitance

    1.5 pF

Other

  • RF-service anode dissipation

    13.5 W

    RF