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DA1

Directly heated low-voltage triode for low-frequency amplification 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 for low-frequency amplification in compact equipment such as hearing aids. Published operating points are 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: 80000 Ω
Transconductance: 0.0004 S
Amplification factor: 32
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
0.1 mA
Va=20 V
Grid voltage
-0.15 V
Va=20 V
Anode voltage
40 V
Va=40 V
Anode current
0.25 mA
Va=40 V
Grid voltage
-0.25 V
Va=40 V
Plate voltage maximum
100 V
Grid circuit resistance maximum
1 Mohm

Characteristic

Transconductance
200 uS
Va=20 V
Plate resistance
150000 ohm
Va=20 V
Amplification factor
30
Va=20 V
Transconductance
400 uS
Va=40 V
Plate resistance
80000 ohm
Va=40 V
Amplification factor
32
Va=40 V

Capacitance

Anode-to-grid capacitance
1.6 pF
Input capacitance
3.8 pF
Output capacitance
5.4 pF