Tube-number record
4242-A
0 archive entries
4242-A is a tube type in the TubeDatabase archive (class: Triode). Recorded specifications: brand Standard Valves, construction Triode, socket 4-pin, maximum plate voltage 1250 V, and maximum plate dissipation 85 W. The archive does not yet hold a photographed example of this type.
BrandStandard Valves
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeHard glass bulb
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage1250 V
Plate Dissipation85 W
Cathode Current150 mA
Audio Performance
Power Output18 W
Key Features
- Molybdenum anode
- Hard glass bulb
- Constant voltage filament type
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A AF Amp and Modulator | 1250 V | 4200 | 3100 | 13 | 60 mA |
| Class A AF Amp and Modulator (Alt) | 1000 V | 4200 | 3100 | 13 | 75 mA |
| Class B AF Amp and Modulator (2 valves) | 1250 V | — | — | — | 150 mA |
| Class C Telegraphy | 1250 V | — | — | — | 150 mA |
Application Notes
Valve should be mounted so that the plane of the filament is vertical.
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