RS 391
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BrandTelefunken
ClassTransmitting Pentode
BaseLg-Nr. 1678
Filament12.6V @ 1.3mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide cathode
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation110 W
Grid 2 Voltage450 V
Grid 1 Voltage-450 V
Cathode Current175 mA
H-C Voltage100 V
Audio Performance
Power Output100 W
Key Features
- 100 Watt-Sendepentode
- Oxyd-Kathode
- Grid Voltage Modulation
- Suppressor Grid Modulation
- Plate Voltage Modulation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier | 1000V | 4500 | - | 90 | 100mA |
| Suppressor Grid Modulation (Carrier) | 1500V | - | - | - | 15mA |
Application Notes
A series resistor (min 3000 Ohms) is required in the screen grid circuit to prevent overloading.
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