WE20

Variable-mu triode-hexode frequency changer for superheterodyne receivers. The triode serves as local oscillator while the controlled hexode performs mixing and supports receiver gain regulation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 200 mA

Description

The WE20 is a variable-mu triode-hexode frequency changer, using its triode as the local oscillator and its hexode as the mixer.

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: 6.3 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
Max plate voltage: 150 V
Max plate dissipation: 1 W

Oscillator triode section.

Section 2

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 1500000 Ω
Transconductance: 0.00065 S
Max plate voltage: 250 V
Max screen voltage: 100 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.5 W

Variable-mu mixer hexode 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.

Data set 01

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 2

Hexode

Characteristics

Plate Voltage
250 V
Screen Voltage
100 V
Plate Current
2.3 mA
Screen Current
3 mA
Conversion Transconductance
650 uS
Control Range
100 ratio