Tube-number record
4048-A
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BrandStandard Valves
ClassHalf Wave, Hot Cathode Mercury Vapour Rectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time30s
Absolute Maximum Ratings
Plate Voltage1600 V
Cathode Current750 mA
Audio Performance
Key Features
- Half wave
- Hot cathode
- Mercury vapour
- Constant current type filament
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Circuit 2 (2 valves) | 500 V | — | — | — | 450 mA |
| Circuit 3 (4 valves) | 1000 V | — | — | — | 450 mA |
| Circuit 4 (3 valves) | 750 V | — | — | — | 550 mA |
Application Notes
This rectifier being directly heated, the output circuit must be connected to the mid-point of the filament transformer. Pre-heating of 15 minutes is required after transport.
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