DH719

Triple-diode-triode for FM and FM/AM receiver detector and amplifier service, combining three diode sections with one triode.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 4
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 450 mA

Description

The Marconi DH719 is a triple-diode-triode for fm and fm/am receiver detector and amplifier service.

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: 450 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

4 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 48000 Ω
Transconductance: 0.00145 S
Amplification factor: 70
Max plate voltage: 300 V
Max plate dissipation: 1 W

Triode section. Diode ratings and capacitances are retained in parameters because only one representative technical section row is emitted in this compact extraction.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 10 mA

Physical diode section; Marconi source specifies diode PIV 350 V and maximum current 10 mA.

Section 3

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 10 mA

Physical diode section; Marconi source specifies diode PIV 350 V and maximum current 10 mA.

Section 4

Diode

X-ray radiationInterelectrode capacitances

Max cathode current: 10 mA

Physical diode section; Marconi source specifies diode PIV 350 V and maximum current 10 mA.

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
Heater current
450 mA
Triode maximum plate voltage
300 V
TriodeSection
Diode peak inverse voltage
350 V
DiodeSections
Diode current maximum
10 mA
DiodeSection

Characteristic

Triode amplification factor
70
TriodeSection
Triode transconductance
1450 uS
TriodeSection
Triode plate resistance
48000 ohm
TriodeSection

Construction

Physical diode count
3
Physical triode count
1