Tube-number record

WT77

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BrandMarconi

ClassVariable-Mu R.F. Pentode

BaseMiniature 7-pin (B7G)

Filament6.3 V @ 0.2 mA

Construction

Primary TypePentode

EnvelopeTubular

SectionsSingle

Heater NotesIndirectly heated

Plate Voltage250 V

Plate Dissipation2.5 W

Grid 2 Voltage250 V

Key Features

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Standard	200 V	2500	500000	—	8 mA

The maximum D.C. resistance between control grid and cathode must not exceed 4M Ohms.

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