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CX220

Power triode for audio-output, amplifier, or oscillator service with manufacturer operating data supporting substantial power delivery.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: UV99
Base pins: -
Nominal heater: 3.3 V / 630 mA

Description

CX220: Cunningham power amplifier triode. The complete bulletin was read for construction, ratings, circuit recommendations, and operating characteristics.

Socket description

Bayonet base family 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: UV99
Base pins: -
Nominal heater voltage: 3.3 V
Nominal heater current: 630 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: 8000 Ω
Transconductance: 0.000415 S
Amplification factor: 3.3

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
3.3 V
Filament/heater current
630 mA
Plate resistance
8000 ohm
Transconductance
415 uS
Amplification factor
3.3