DCH21

Directly heated triode-hexode frequency converter for battery superheterodyne receivers. It combines an oscillator triode with a hexode mixer, providing useful conversion gain from low-voltage portable-radio supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 100 mA

Description

Directly heated triode-hexode frequency converter for battery superheterodyne receivers. The supplied Philips sheet was read for heater/filament data, ratings, characteristics, capacitances, and operating conditions where published.

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: 1.4 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: 400000 Ω
Transconductance: 0.00045 S
Amplification factor: 20
Max plate voltage: 135 V
Max screen voltage: 120 V
Max plate dissipation: 0.2 W
Max screen dissipation: 0.2 W
Max cathode current: 10 mA

Hexode converter section; conversion transconductance used.

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0014 S
Amplification factor: 28
Max plate voltage: 100 V
Max plate dissipation: 0.5 W

Triode oscillator 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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Hexode

Characteristics

Plate voltage
90 V
Screen voltage
60 V
Plate current
1 mA
Screen current
2 mA
Conversion transconductance
450 uS
Plate resistance
0.4 Mohm

Other

Maximum plate voltage
135 V
Maximum plate dissipation
0.2 W
Maximum screen dissipation
0.2 W
Maximum cathode current
10 mA

SECTION 2

Triode

Characteristics

Plate voltage
60 V
Grid voltage
0 V
Transconductance
1.4 mA/V
Amplification factor
28

Other

Maximum plate voltage
100 V
Maximum plate dissipation
0.5 W