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Power - Pentode (NOT beam) ·Pentode

DL70

Subminiature VHF output pentode designed for battery communications equipment. It provides radio-frequency power at VHF while retaining the low filament demand required by portable systems.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
WIRE8
Base pins
8
Nominal heater
1.25 V / 110 mA

Description

Subminiature VHF output pentode for battery communications equipment.

Socket description

Subminiature all-glass 8-wire lead family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
WIRE8
Base pins
8
Nominal heater voltage
1.25 V
Nominal heater current
110 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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
150000 Ω
Transconductance
0.0019 S
Max plate voltage
150 V
Max screen voltage
110 V

Published ratings, characteristics, operating conditions and capacitances extracted from supplied Mullard source.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • HeaterOrFilamentVoltage

    1.25 V

  • HeaterOrFilamentCurrent

    110 mA

  • PlateToGridCapacitanceMaximum

    0.1 pF

  • Input Capacitance

    3 pF

  • Output Capacitance

    5.6 pF

  • Plate Voltage

    135 V

  • Screen Voltage

    90 V

  • Plate Current

    7.5 mA

  • Screen Current

    1.5 mA

  • Control Grid Voltage

    -7.5 V

  • Transconductance

    1.9 mA/V

  • Plate Resistance

    150 kohm

  • MaximumOperatingFrequency

    200 MHz

Other

  • Power Output

    800 mW

    ClassC;Oscillator

  • Power Output

    450 mW

    ClassC;Amplifier;Frequency=200MHz