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Voltage Pentode or Tetrode (under 100V) ·Diode-Pentode

DAF191

Directly heated battery diode-pentode combining signal detection with low-frequency voltage amplification. Its 1.4 V, 50 mA filament suits portable receivers while the pentode provides useful gain following the detector stage.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
-
Base pins
7
Nominal heater
1.4 V / 50 mA

Description

A directly heated 1.4 V diode-pentode for low-frequency amplification, with a 50 mA filament and separate signal-diode and pentode functions.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
7
Nominal heater voltage
1.4 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

2 physical sections, each with unique specifications.

Section 1

Diode

X-ray radiationInterelectrode capacitances
Max plate voltage
90 V

Published ratings and characteristics promoted from the printed technical data.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
600000 Ω
Transconductance
0.0007 S
Max plate voltage
90 V
Max screen voltage
90 V
Max plate dissipation
0.15 W
Max screen dissipation
0.05 W
Max cathode current
2.5 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

Diode

Characteristics

  • Heater or filament voltage

    1.4 V

    Published nominal value

  • Heater or filament current

    50 mA

    Published nominal value

  • Transconductance

    700 µS

    Published operating characteristic

Other

  • Maximum plate dissipation

    0.15 W

    Published limit

SECTION 2

Pentode

Characteristics

  • Heater or filament voltage

    1.4 V

    Published nominal value

  • Heater or filament current

    50 mA

    Published nominal value

  • Transconductance

    700 µS

    Published operating characteristic

Other

  • Maximum plate dissipation

    0.15 W

    Published limit