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CX330

Cunningham general-purpose directly heated triode for detector and amplifier service in early receiving equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UX4
Base pins: -
Nominal heater: 2 V / 60 mA

Description

CX330: Cunningham general-purpose detector/amplifier triode. The complete bulletin was read for construction, ratings, circuit recommendations, and operating 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: 2 V
Nominal heater current: 60 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 13000 Ω
Transconductance: 0.0007 S
Amplification factor: 9.3

Published ratings and characteristic constants promoted where applicable; operating recommendations retained 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

1931 Cunningham Radio Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Filament/heater voltage
2 V
Filament/heater current
60 mA
Plate resistance
13000 ohm
Transconductance
700 uS
Amplification factor
9.3