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Tube Tinker — Electron Tube Database
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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

DL67

Subminiature output pentode designed for hearing aids and other very-low-power audio equipment. Its directly heated miniature construction provides useful output while minimizing battery drain.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
Subminiature
Socket code
WIRE8
Base pins
8
Nominal heater
1.25 V / 13.3 mA

Description

Subminiature output pentode for hearing aids and other very-low-power audio 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
Subminiature
Socket code
WIRE8
Base pins
8
Nominal heater voltage
1.25 V
Nominal heater current
13.3 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
0.00044 S
Amplification factor
9
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
0.6 mA

Published ratings and characteristics promoted from the printed technical data.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    1.25 V

    Nominal

  • HeaterCurrentNominal

    13.3 mA

    Nominal

  • Maximum Plate Voltage

    45 V

  • Maximum Screen Voltage

    45 V

  • Maximum Plate Dissipation

    0.025 W

  • Maximum Screen Dissipation

    0.006 W

  • Maximum Cathode Current

    0.6 mA

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

    2.2 pF

  • Grid-to-plate capacitance

    - to 0.2 pF

Other

  • Plate voltage

    22.5 V

    HearingAid

  • Screen voltage

    22.5 V

    HearingAid

  • Plate current

    0.475 mA

    HearingAid

  • Screen current

    0.1 mA

    HearingAid

  • Grid voltage

    -0.2 V

    HearingAid

  • Power output

    1.8 mW

    HearingAid

Characteristic

  • Transconductance

    420 uS

  • Plate resistance

    0.4 Mohm