- Base
- E9-1
- Socket code
- B9A
- Sections
- 2
- Heater
- 32 V / 150 mA
- Plate
- S1: 250 V / 1 W · S2: 250 V / 7 W
- Screen
- S2: 250 V / 1.8 W
- Ik max
- S1: 15 mA · S2: 50 mA
- rP
- S2: 15,000 Ω
- gm
- S1: 2.5 mA/V · S2: 6.8 mA/V
- μ
- S1: 70
9 pins - B9A - Small-button Noval 9-contact
Combination triode-pentode with a triode for audio-frequency amplification and a power pentode for output service.