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Voltage Pentode or Tetrode (under 100V) ·Pentode

DF191

Pentode designed for radio-frequency or wide-band amplifier service in receiving or electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 1.4 V / 50 mA

Description

Battery pentode for high-frequency amplification.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B7G
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

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 250000 Ω
Transconductance: 0.00085 S
Max plate voltage: 90 V
Max screen voltage: 67.5 V
Max plate dissipation: 0.35 W
Max screen dissipation: 0.12 W
Max cathode current: 6 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

Pentode

Other

HeaterVoltageNominal
1.4 V
Nominal
HeaterCurrentNominal
50 mA
Nominal
Maximum Plate Voltage
90 V
Maximum Screen Voltage
67.5 V
Maximum Plate Dissipation
0.35 W
Maximum Screen Dissipation
0.12 W
Maximum Cathode Current
6 mA

Characteristic

Transconductance
850 µS
Typical
Plate Resistance
250000 ohm
Typical