Tube-number record
4078-A
0 archive entries
4078-A is a tube type in the TubeDatabase archive (class: Half Wave, Hot Cathode Mercury Vapour Rectifier). Recorded specifications: brand Standard Valves, construction Rectifier, socket Special / none, and maximum plate voltage 20000 V. The archive does not yet hold a photographed example of this type.
BrandStandard Valves
ClassHalf Wave, Hot Cathode Mercury Vapour Rectifier
BaseSpecial / none
Construction
Primary TypeRectifier
Rectifier TypeHalf Wave
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time5s
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Circuit 2 (2 valves) | 6400 V | — | — | — | 5000 mA |
| Circuit 3 (4 valves) | 12800 V | — | — | — | 5000 mA |
| Circuit 4 (3 valves) | 9100 V | — | — | — | 7500 mA |
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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