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Voltage Pentode - Sharp Cutoff (single) ·Pentode

SF1A

High-frequency receiving pentode designed for RF amplification, including short-wave or VHF service according to type.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.9 V / 500 mA

Description

SF1A is a Telefunken high-frequency pentode intended for amplification down to approximately 1 m wavelength.

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: 1.9 V
Nominal heater current: 500 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: 1500000 Ω
Transconductance: 0.0015 S
Max plate voltage: 220 V
Max screen voltage: 140 V
Max plate dissipation: 1 W
Max screen dissipation: 0.3 W

Published maximum ratings and characteristics promoted from the approved datasheet; additional useful values retained as parameters.

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

194X Wehrmacht Rohren

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater Voltage
1.9 V
Nominal published value
Heater Current
500 mA
Nominal/approximate published value
Maximum Anode Voltage
220 V
Published datasheet value
Maximum Screen Voltage
140 V
Published datasheet value
Maximum Anode Dissipation
1 W
Published datasheet value
Maximum Screen Dissipation
0.3 W
Published datasheet value

Characteristics

Plate Resistance
1500000 ohm
Published datasheet value
Transconductance
0.0015 A/V
Published datasheet value
Amplification Factor
2000
Published datasheet value