DAF41

Directly heated battery diode-pentode combining a detector diode with a high-resistance pentode for resistance-coupled audio voltage amplification. Its 1.4 V, 50 mA filament suits low-consumption portable receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.4 V / 50 mA

Description

Directly heated diode-pentode for resistance-coupled audio amplification in battery receivers.

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: 1.4 V
Nominal heater current: 50 mA
Parallel heater voltage: 1.4 V
Parallel heater current: 50 mA
Series capable: Yes

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 2200000 Ω
Transconductance: 0.0007 S
Max plate voltage: 135 V
Max screen voltage: 85 V
Max plate dissipation: 0.1 W
Max screen dissipation: 0.02 W

Promoted from clearly identified published ratings/characteristics; additional operating points, capacitances, rectifier conditions, and application-specific values are retained in TUBE_SECTION_PARAMETER.

Section 2

Diode

X-ray radiationInterelectrode capacitances

Rectifier peak inverse voltage: 100 V
Rectifier nominal output current: 200 mA

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

Grid capacitance
2.8 pF
Section1
Plate capacitance
3.7 pF
Section1
Grid-to-plate capacitance maximum
0.0065 pF
Section1
Diode capacitance
2.1 pF
Section1

Other

Supply voltage
67.5 V
AudioAmplifier
Plate load
0.22 MΩ
AudioAmplifier
Screen resistor
0.82 MΩ
AudioAmplifier
Plate current
0.17 mA
AudioAmplifier
Screen current
0.04 mA
AudioAmplifier
Required input voltage
60 mV
AudioAmplifier
Supply voltage
150 V
AudioAmplifier
Plate current
0.24 mA
AudioAmplifier

SECTION 2

Diode

Other

Peak inverse voltage maximum
100 V
DetectorDiode
Average diode current maximum
0.2 mA
DetectorDiode
Peak diode current maximum
1.2 mA
DetectorDiode

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum anode voltage
135 V
Maximum screen voltage
85 V