Tube-number record
5A/128B
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BrandStandard Telephones and Cables (STC)
ClassR.F. Pentode
Base5-pin
Filament4 V @ 1 mA
Construction
Primary TypePentode
Envelopeglass
Sectionssingle
Filament / Heater
Heater NotesIndirectly-heated oxide-coated
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Cathode Current9 mA
Audio Performance
Typical THD8.6%
Power Output0.315 W
Key Features
- Indirectly-heated
- Oxide-coated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Pentode Operation (Va 250) | 250 V | 3000 | 800000 | — | 3.9 mA |
| RF Pentode Operation (Va 200) | 200 V | 3000 | 800000 | — | 3.8 mA |
| RF Pentode Operation (Va 150) | 150 V | 3000 | 800000 | — |
Application Notes
RF Pentode designed for high frequency applications with low inter-electrode capacitance.
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