Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage - Triode (single) ·Triode

DA2

Directly heated low-voltage triode for voltage-amplifier or output service in compact battery equipment such as hearing aids.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2 V / 50 mA

Description

Directly heated low-voltage triode intended as a voltage amplifier or output valve in compact equipment such as hearing aids, with operating data at 20 V and 40 V anode voltage.

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
2 V
Nominal heater current
50 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

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
13600 Ω
Transconductance
0.0005 S
Amplification factor
6.9
Max plate voltage
100 V

Promoted characteristics from 40 V operating point.

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

Triode

Other

  • Anode voltage

    20 V

    Va=20 V

  • Anode current

    0.5 mA

    Va=20 V

  • Grid voltage

    -0.9 V

    Va=20 V

  • Anode voltage

    40 V

    Va=40 V

  • Anode current

    1.25 mA

    Va=40 V

  • Grid voltage

    -2.15 V

    Va=40 V

  • Plate voltage maximum

    100 V

  • Grid circuit resistance maximum

    1 Mohm

Characteristic

  • Transconductance

    350 uS

    Va=20 V

  • Plate resistance

    18900 ohm

    Va=20 V

  • Amplification factor

    6.6

    Va=20 V

  • Transconductance

    500 uS

    Va=40 V

  • Plate resistance

    13600 ohm

    Va=40 V

  • Amplification factor

    6.9

    Va=40 V

Capacitance

  • Anode-to-grid capacitance

    1.4 pF

  • Input capacitance

    3.4 pF

  • Output capacitance

    5.4 pF