DH63

Double-diode triode for radio receiver detection, automatic-volume-control generation, and resistance-coupled low-frequency amplification. The tube integrates detector and control rectifiers with the first audio-frequency voltage-amplifier stage.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 3
Base: -
Socket code: IO
Base pins: 8
Nominal heater: 6.3 V / 300 mA

Description

The Marconi DH63 is a octal double-diode-triode for detection, avc, and resistance-coupled low-frequency amplification.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: IO
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 300 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

3 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Triode section. Diode ratings and capacitances are retained in parameters because only one representative technical section row is emitted in this compact extraction. Marconi DH63 double-diode triode used for detection, automatic volume control, and resistance-coupled first audio amplification. Datasheet 340 V is a typical anode SUPPLY voltage, not an explicitly specified absolute maximum plate voltage. Interelectrode capacitances are published, including triode anode-grid 1 pF, grid-earth 2.6 pF, anode-earth 6.2 pF.

Section 2

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

Section 3

Diode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Physical diode section added during approved section-structure reconciliation.

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater voltage
6.3 V
Triode maximum plate voltage
340 V
TriodeSection
Typical stage gain maximum
32 x

Construction

Physical diode count
2
Physical triode count
1

Application

Primary application
Detection, AVC, and resistance-coupled LF amplification

Capacitance

Triode anode-grid capacitance
1 pF
Triode grid-earth capacitance
2.6 pF
Triode anode-earth capacitance
6.2 pF
Diodes-earth capacitance
7.8 pF