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SRS551

High-transconductance RFT transmitting pentode for HF/VHF driver and final stages to approximately 150 MHz.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 2.1 A

Description

Radiation-cooled transmitting pentode for driver and final stages in transmitters, especially VHF transmitters and modulators, and for electromedical equipment.

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: 6.3 V
Nominal heater current: 2.1 A
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

Transconductance: 0.018 S
Max plate voltage: 1000 V
Max screen voltage: 600 V
Max plate dissipation: 60 W
Max screen dissipation: 10 W
Max grid dissipation: 0.5 W
Max cathode current: 260 mA

Published ratings and characteristics promoted where clearly stated.

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
6.3 V
Nominal
HeaterCurrentNominal
2.1 A
Nominal
Maximum Plate Voltage
1000 V
Maximum Screen Voltage
600 V
Maximum Plate Dissipation
60 W
Maximum Screen Dissipation
10 W
MaximumGridDissipation
0.5 W
Maximum Cathode Current
260 mA
Maximum Frequency
150 MHz
RFOutputPower
155 W
ClassC; <30 MHz

Characteristic

Transconductance
18000 µS
Typical