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Voltage - Triode (single) ·Triode

DB3

Compact directly heated medium-impedance triode with low-voltage operating data for small battery-powered electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
1.5 V / 70 mA

Description

Compact directly heated medium-impedance triode with 1.5 V, 70 mA filament and operating points 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
1.5 V
Nominal heater current
70 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
7600 Ω
Transconductance
0.00062 S
Amplification factor
4.7
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

    -1 V

    Va=20 V

  • Anode voltage

    40 V

    Va=40 V

  • Anode current

    1.8 mA

    Va=40 V

  • Grid voltage

    -2.8 V

    Va=40 V

  • Plate voltage maximum

    100 V

  • Grid circuit resistance maximum

    1 Mohm

Characteristic

  • Transconductance

    350 uS

    Va=20 V

  • Plate resistance

    13500 ohm

    Va=20 V

  • Amplification factor

    4.7

    Va=20 V

  • Transconductance

    620 uS

    Va=40 V

  • Plate resistance

    7600 ohm

    Va=40 V

  • Amplification factor

    4.7

    Va=40 V