Tube-number record
147
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BrandHygrade Sylvania Corporation
ClassAmplifier Pentode
BaseLoctal
Filament14 V @ 0.24 mA
Construction
Primary TypePentode
EnvelopeTG
Filament / Heater
Heater NotesNominal rating 14.0V; typical operation 12.6V
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 2 Voltage150 V
Audio Performance
Key Features
- Coated Unipotential Cathode
- Lock-In Base
- Internal Shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Condition I (Fixed Screen Supply) | 300 V | 5800 | 300000 | — | 10 mA |
| Condition II (Series Screen Resistor) | 300 V | 5800 | 300000 | — | 10 mA |
Application Notes
Condition II gives an extended cut-off characteristic and should be used when gain is controlled by varying the bias. When a screen supply voltage in excess of 150 volts is used, a series screen resistor must be used to limit the voltage at the screen to 150 volts when the plate current is at its rated value.
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