Tube-number record
5B/300-B
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BrandStandard
ClassRF Pentode
Base7-pin (non-miniature)
Filament10 V @ 800 mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation30 W
Grid 2 Voltage300 V
Cathode Current85 mA
Audio Performance
Key Features
- Indirectly heated oxide coated cathode
- Anode connected to top cap type B
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Power Amplifier Class B Telephony | 500 V | — | — | — | 35 mA |
| RF Power Amplifier Class C Telephony | 500 V | — | — | — | 35 mA |
| RF Power Amplifier or Oscillator Class C Telegraphy | 500 V | — | — | — |
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