Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode (over 1000V 100W) ·Triode

303C

Taylor directly heated power triode intended particularly for diathermy and RF oscillator service. Its roughly 125 W plate dissipation and kilovolt-class plate rating suit industrial high-frequency generation rather than ordinary receiving or low-power audio applications.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
-
Nominal heater
10 V / 4 A

Description

Taylor 303-C is listed in the catalog as a 150-watt diathermy tube; this source page provides no additional electrical characteristics.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
UX4
Base pins
-
Nominal heater voltage
10 V
Nominal heater current
4 A
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
Plate resistance
4600 Ω
Transconductance
0.0045 S
Amplification factor
20
Max plate voltage
2000 V
Max plate dissipation
125 W

Published maximum ratings and characteristics promoted from the approved datasheet; mode-specific values preserved as parameters.

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

193X Taylor Transmitting

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Filament Voltage

    10 V

    Nominal published value

  • Filament Current

    4 A

    Nominal published value

  • Maximum Operating Plate Voltage

    2000 V

    Class C oscillator / RF power-amplifier service where published

  • Maximum Plate Dissipation

    125 W

    Published maximum rating

  • Plate to Grid, mmf

    9 pF

    Published direct interelectrode capacitance

  • Gride to Filament, mmf

    6 pF

    Published direct interelectrode capacitance

  • Plate to Filament

    4 pF

    Published direct interelectrode capacitance

Characteristics

  • Plate Resistance

    4600 ohm

    Published general characteristic

  • Mutual Conductance

    4500 µS

    Published general characteristic

  • Amplification Factor

    20

    Published general characteristic