U18/20
0 Tubes in archive
BrandMarconi
ClassRectifier
BaseBritish 4 pin
Construction
Primary TypeDuo-diode
Rectifier TypeFull-Wave
EnvelopeDome top tubular
Sections2
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage850 V
Cathode Current275 mA
Audio Performance
Key Features
- Directly heated
- Bi-phase half wave
- Capacitor or Choke input
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Capacitor Input (Case 1) | 500V | - | - | - | 250mA |
| Capacitor Input (Case 2) | 850V | - | - | - | 125mA |
| Choke Input (Case 1) | 550V | - | - | - | 275mA |
| Choke Input (Case 2) | 850V | - | - | - | 150mA |
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