4078-A
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BrandStandard Valves
ClassHalf Wave, Hot Cathode Mercury Vapour Rectifier
BaseSpecial 2-pin
Construction
Primary TypeMercury Vapour Rectifier
Rectifier TypeHalf Wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time5s
Absolute Maximum Ratings
Plate Voltage20000 V
Cathode Current10000 mA
Audio Performance
Key Features
- Shielded cathode
- Constant voltage type filament
- Natural or Forced ventilation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Circuit 2 (2 valves) | 6400V | - | - | - | 5000mA |
| Circuit 3 (4 valves) | 12800V | - | - | - | 5000mA |
| Circuit 4 (3 valves) | 9100V | - | - | - | 7500mA |
| Circuit 5 (6 valves) | 9100V | - | - | - | 15000mA |
| Circuit 6 (6 valves) | 18200V | - | - | - | 7500mA |
Application Notes
After shipment the filament must be run at full voltage for 30 minutes before any anode voltage is applied. The filament transformer should be connected so that anode and filament voltages are 90 degrees out of phase (quadrature). If quadrature operation is not possible, peak anode and output current must be reduced by 50%.
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