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Voltage Pentode - Remote Cutoff (single) ·Pentode

W77

Variable-mu or remote-cutoff pentode designed for RF, IF, broadband, or AVC-controlled receiver amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 200 mA

Description

Miniature variable-mu RF pentode for receiver RF and IF 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: 6.3 V
Nominal heater current: 200 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: 500000 Ω
Transconductance: 0.0025 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.5 W

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater/Filament Voltage
6.3 V
Heater/Filament Current
200 mA
Transconductance
2500 uS
Plate Resistance
500000 ohm

Other

Maximum/Published Anode Voltage
250 V
Maximum/Published Screen Voltage
250 V
Maximum Anode Dissipation
2.5 W
Maximum Screen Dissipation
0.5 W

Capacitance

Grid-Anode Capacitance
0.006 pF
Input Capacitance
4.2 pF
Output Capacitance
7 pF