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220

Directly heated triode for early battery-operated receiving and amplification service. Available source material does not establish a narrower function confidently.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 4
Nominal heater: 3.3 V / 132 mA

Description

The 220 is a triode described in the Cunningham Radio Tube Manual for detector, amplifier, oscillator, rectifier, or power-output service as applicable to the type.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 4
Nominal heater voltage: 3.3 V
Nominal heater current: 132 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: 47000 Ω
Transconductance: 0.000425 S
Amplification factor: 20
Max plate voltage: 180 V

Core published characteristics promoted conservatively from the approved manual sheet.

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 Cunningham

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater/filament voltage
3.3 V
Published nominal
Heater/filament current
132 mA
Published nominal
Transconductance
425 uS
Published characteristic
Amplification factor
20
Published characteristic
Plate resistance
47000 Ohm
Published characteristic