Tube-number record
147
0 archive entries
147 is a tube type in the TubeDatabase archive (class: Amplifier Pentode). Recorded specifications: brand Hygrade Sylvania Corporation, construction Pentode, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 4 W. The archive does not yet hold a photographed example of this type.
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
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.
0 results