Tube-number record
4033-A
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BrandStandard Valves
ClassTriode
Base5-pin
Filament6 V @ 1.4 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated oxide coated, constant voltage type.
Absolute Maximum Ratings
Plate Voltage600 V
Plate Dissipation25 W
Cathode Current170 mA
Audio Performance
Power Output4 W
Key Features
- Indirectly heated
- Standard Aircraft radio suitability (AF variant)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Constants | 300 V | 9000 | 1670 | 5 | 50 mA |
| Class A A.F. Amp | 400 V | — | — | — | 50 mA |
| Class B A.F. Amp (Balanced 2-valve) | 600 V | — | — | — | 80 mA |
Application Notes
The 4033-AF code indicates special tests for Standard Aircraft radio. Individual biasing is required for each valve in Class B circuits.
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