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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

DL65

Directly heated subminiature output pentode designed for hearing aids. Its tiny filament demand and compact construction provide very-low-power audio output for wearable battery equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
Subminiature
Socket code
-
Base pins
-
Nominal heater
1.25 V / 15 mA

Description

Directly heated subminiature output pentode for hearing aids; the supplied sheet cross-references the DL67 family.

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
15 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
0.00035 S
Amplification factor
8
Max plate voltage
45 V
Max screen voltage
45 V
Max plate dissipation
0.025 W
Max screen dissipation
0.006 W
Max cathode current
1 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 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

    3.7 pF

  • Grid-to-plate capacitance

    - to 0.2 pF

Other

  • Plate voltage

    22.5 V

    HearingAid

  • Screen voltage

    22.5 V

    HearingAid

  • Plate current

    0.3 mA

    HearingAid

  • Screen current

    0.075 mA

    HearingAid

  • Grid voltage

    -1.4 V

    HearingAid

Characteristic

  • Transconductance

    350 uS

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Anode voltage

    22.5 V

    ClassA

  • Screen-grid voltage

    22.5 V

    ClassA

  • Anode current

    0.475 mA

    ClassA

  • Screen-grid current

    0.1 mA

    ClassA

  • Control-grid voltage

    -0.2 V

    ClassA

Capacitance

  • Input capacitance

    2.5 pF

  • Output capacitance

    2.2 pF

  • Anode-grid capacitance

    <0.2 pF