Tube-number record

56R9

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BrandGeneral Electric

ClassTriode-Pentode

BaseCompactron

Filament14 V @ 0.15 mA

Construction

Primary TypeCompactron

EnvelopeT-9

SectionsHigh-mu Triode and Beam-power Pentode

Heater NotesSeparate heaters for the two sections; Triode 14V, Pentode 42V.

Plate Voltage150 V

Plate Dissipation6.5 W

Grid 2 Voltage135 V

Cathode Current65 mA

H-C Voltage200 V

Typical THD10%

Power Output2.3 W

Key Features

Mode	Plate V	Gm (µmhos)	Rp (Ω)	µ	Plate mA
Pentode Section (Class A Power Amplifier)	120 V	7500	10000	—	49 mA
Triode Section (Class A Voltage Amplifier)	100 V	1800	55500	100	0.6 mA

The triode is intended for audio-frequency voltage-amplifier service and the pentode for power-amplifier service.

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