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Power - Beam Single (NOT sweep) (under 10W) ·BeamPower

375A

Western Electric heater-cathode beam-power pentode designed for audio-frequency amplification at low plate voltages, particularly circuits operating from plate supplies as low as 48 volts.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
6
Nominal heater
20 V / 320 mA

Description

The 375A is a heater-cathode beam-power pentode designed for audio-frequency amplification at plate voltages up to 130 V, particularly where only a 48 V plate supply is available.

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
6
Nominal heater voltage
20 V
Nominal heater current
320 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
Plate resistance
9300 Ω
Transconductance
0.0048 S
Max plate voltage
130 V
Max screen voltage
130 V
Max plate dissipation
6 W
Max screen dissipation
1.3 W

Representative characteristics use the 45 V plate/screen point highlighted on the first page; alternate operating points are 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

2026 Western Electric 300s

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

  • GridPlateCapacitance

    1 pF

  • Input Capacitance

    13.5 pF

  • Output Capacitance

    8.5 pF

Characteristic

  • Maximum Signal Plate Current

    50 mA

    Maximum rating

  • Plate Resistance

    7800 ohm

    Plate=80 V

  • Plate Resistance

    8000 ohm

    Plate=120 V

  • Transconductance

    6600 uS

    Plate=80 V

  • Transconductance

    6200 uS

    Plate=120 V

  • Maximum Signal Power Output

    0.25 W

    Plate=45 V

  • Maximum Signal Power Output

    1.4 W

    Plate=80 V

  • Maximum Signal Power Output

    2.5 W

    Plate=120 V