UCH42

Triode-hexode frequency changer for AC/DC superheterodyne receivers. The oscillator triode supplies local oscillation while the high-resistance mixer performs frequency conversion.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B8A
Base pins: 8
Nominal heater: 14 V / 100 mA

Description

Triode-heptode frequency changer for radio receiver oscillator and mixer service. The supplied French datasheet was translated to English for descriptive output.

Socket description

Rimlock 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B8A
Base pins: 8
Nominal heater voltage: 14 V
Nominal heater current: 100 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

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Max plate voltage: 250 V
Max screen voltage: 125 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.3 W

Hexode mixer/converter section; SectionType=Other because Hexode is not in the canonical SectionType vocabulary.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 7400 Ω
Transconductance: 0.0021 S
Amplification factor: 15.5
Max plate voltage: 175 V
Max plate dissipation: 0.8 W

Oscillator triode 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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Hexode

Other

Plate Voltage
170 V
Hexode
Screen Voltage
70 V
Hexode grids 2+4
Plate Current
2.1 mA
Hexode
Screen Current
2.6 mA
Hexode grids 2+4

Characteristic

Conversion Transconductance
670 uS
Hexode

Capacitance

Input Capacitance
4.5 pF
Hexode cold
Output Capacitance
9.1 pF
Hexode cold
CouplingCapacitance
0.1 pF
Hexode cold

SECTION 2

Triode

Other

Plate Voltage
100 V
Triode
Grid Voltage
-2 V
Triode
Plate Current
5.5 mA
Triode

Capacitance

Input Capacitance
7.7 pF
Triode
Output Capacitance
4.4 pF
Triode