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Power - Pentode (NOT beam) ·Pentode

DL64

Subminiature hearing-aid output pentode designed for operation from approximately 15 V HT supplies. Its extremely low-power construction provides audio output in miniature personal equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
Subminiature
Socket code
-
Base pins
-
Nominal heater
1.25 V / 10 mA

Description

Subminiature hearing-aid output pentode for 15 V HT supplies.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
Subminiature
Socket code
-
Base pins
-
Nominal heater voltage
1.25 V
Nominal heater current
10 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Subminiature - 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
400000 Ω
Transconductance
0.00018 S
Amplification factor
4.5
Max plate voltage
45 V
Max screen voltage
45 V
Max cathode current
0.6 mA

Subminiature output pentode for hearing aids.

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

    10 mA

  • PlateToGridCapacitanceMaximum

    0.25 pF

  • Input Capacitance

    2.5 pF

  • Output Capacitance

    2.4 pF

  • Plate Voltage

    15 V

  • Screen Voltage

    15 V

  • Plate Current

    160 uA

  • Screen Current

    40 uA

  • Control Grid Voltage

    -1.5 V

Other

  • Load Resistance

    100 kohm

    ClassA

  • Power Output

    0.95 mW

    ClassA

Data set 02

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Control-grid capacitance

    2.5 pF

  • Plate capacitance

    2.4 pF

  • Grid-to-plate capacitance

    - to 0.25 pF

Other

  • Plate voltage

    15 V

    ClassA HearingAid

  • Screen voltage

    15 V

    ClassA HearingAid

  • Plate current

    160 uA

    ClassA HearingAid

  • Screen current

    40 uA

    ClassA HearingAid

  • Grid voltage

    -1.5 V

    ClassA HearingAid

Characteristic

  • Transconductance

    180 uS

Data set 03

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Anode voltage

    15 V

    ClassA

  • Screen-grid voltage

    15 V

    ClassA

  • Anode current

    160 uA

    ClassA

  • Screen-grid current

    40 uA

    ClassA

  • Control-grid voltage

    -1.5 V

    ClassA

Capacitance

  • Input capacitance

    2.5 pF

  • Output capacitance

    2.4 pF

  • Anode-grid capacitance

    <0.25 pF