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Voltage Pentode - High Frequency (single) ·Pentode

5B300BF

RF pentode documented by Standard Valves for high-frequency signal service. Published electrode and capacitance data establish its role as an RF signal-amplifier device rather than an output-stage power tube.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
M7A
Base pins
7
Nominal heater
10 V / 800 mA

Description

RF Pentodes. Output capacity 8µµF. ELECTRODES.

Socket description

British/European 7-pin

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
M7A
Base pins
7
Nominal heater voltage
10 V
Nominal heater current
800 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
Transconductance
0.006 S
Max plate voltage
500 V
Max screen voltage
300 V
Max plate dissipation
30 W
Max screen dissipation
6 W
Max cathode current
60 mA

Explicit alias/equivalent/co-designation printed in source for 5B300B.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Grid-anode capacitance

    1.2 pF

  • Input capacitance

    16 pF

  • Output capacitance

    8 pF

Other

  • Maximum direct anode current

    60 mA

  • Maximum direct screen current

    25 mA

  • Maximum frequency for full ratings

    40 MHz

  • Anode voltage at 70 MHz

    300 V

    70MHz

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Interelectrode capacitances published

    1

    See source table for individual capacitances