TRIPLE-GRID DETECTOR AMPLIFIER

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ClassPentode

BaseSmall 6-Pin

Filament6.3V @ 0.3mA

Primary TypePentode

EnvelopeST-12

Sections1

Heater NotesIndirectly heated cathode

Plate Voltage250 V

Grid 2 Voltage100 V

Key Features

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Pentode Amplifier	250V	1250	1500000	1500	2.3mA

The OCR text appears to represent the plate characteristic curves for a Type 77 tube, showing grid voltage steps and plate current readings.

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