Tube-number record
388
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ClassUHF Triode
Filament1.5 V @ 1.05 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesDirectly heated
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation4.9 W
Grid 1 Voltage-40 V
Cathode Current80 mA
Audio Performance
Key Features
- UHF operation
- Doorknob construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| UHF Oscillator | 250 V | 1500 | — | — | 40 mA |
Application Notes
The 388A (often referred to as 388) is a Western Electric doorknob triode designed for UHF oscillator and amplifier service.
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