Tube-number record
D 2
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BrandPhilips
ClassTriode
Base4-pin
Construction
Primary TypeTriode
EnvelopeGlass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage100 V
Cathode Current3 mA
Audio Performance
Key Features
- High vacuum
- Triode for detection
- HF and LF amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| LF Amplifier | 60 V | — | — | — | — |
| LF Amplifier | 80 V | — | — | — | — |
| LF Amplifier | 100 V | 250 | 40000 | 10 | 2 mA |
Application Notes
Specifically designed for use with a 4-volt battery; requires a 6-ohm adjustable filament resistor. When used as a detector, a plate voltage of 40-60V is sufficient. Can be supplied with various base types, though the standard is Philips 4-pin (A).
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