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
Filament / Heater
Heater NotesSeparate heaters for the two sections; Triode 14V, Pentode 42V.
Absolute Maximum Ratings
Plate Voltage150 V
Plate Dissipation6.5 W
Grid 2 Voltage135 V
Cathode Current65 mA
H-C Voltage200 V
Audio Performance
Typical THD10%
Power Output2.3 W
Key Features
- Compactron
- Separate heaters
- High-mu triode
- Beam-power pentode
Typical Operation
| 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 |
Application Notes
The triode is intended for audio-frequency voltage-amplifier service and the pentode for power-amplifier service.
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