- Base
- —
- Socket code
- B5
- Sections
- 2
- Heater
- 4 V / 1.1 A
- Plate
- S2: 20 V
- Screen
- S2: 45 V
- rP
- S2: 1,000 Ω
- gm
- S2: 3 mA/V
- μ
- S2: 1,000
B5 - European 5-pin base
Early Philips binode combining diode detection with high-gain tetrode amplification for radio receiver signal processing, using a 4 V heater characteristic of prewar European equipment.