20L1

Television twin triode intended for series-heater operation, providing two triode units for receiver circuitry where a 20 V heater is suited to transformerless heater strings.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 12.6 V / 200 mA

Description

Television twin triode for series operation.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 12.6 V
Nominal heater current: 200 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0028 S
Amplification factor: 16
Max plate voltage: 250 V
Max plate dissipation: 3 W

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0028 S
Amplification factor: 16
Max plate voltage: 250 V
Max plate dissipation: 3 W

Second physical triode section; electrically identical twin section.

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.

No source-specific operating conditions are recorded.