U.404
0 Tubes in archive
BrandMazda
ClassHalf Wave Rectifier
BaseB.S.A.
Filament40V @ 100mA
Construction
Primary TypeVacuum Tube
Rectifier TypeHalf-wave
EnvelopeClear
Sections1
Filament / Heater
Heater NotesIndirectly heated — for series operation
Absolute Maximum Ratings
Plate Voltage250 V
Cathode Current99 mA
H-C Voltage550 V
Audio Performance
Key Features
- Indirectly heated
- Series operation
- Unrestricted mounting position
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| 70mA load current | 230V | - | - | - | 70mA |
| 90mA load current | 230V | - | - | - | 90mA |
Application Notes
The 'Internal Connexion' pins are used for mechanical rigidity and must not be connected to the circuit.
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