Tube-number record
9990 / 401A
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ClassRF Amplifier Pentode
BaseMiniature 7-pin (B7G)
Filament6.3 V @ 150 mA
Construction
Primary TypePentode
EnvelopeT 5 1/2
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Plate Voltage200 V
Plate Dissipation1.85 W
Grid 2 Voltage155 V
Grid 1 Voltage-50 V
Cathode Current20 mA
H-C Voltage100 V
Audio Performance
Key Features
- Low supply voltage operation
- High transconductance at 45V
- Operates at very high frequencies
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 45 V | 1900 | — | — | 2.7 mA |
| Class A1 | 90 V | 2000 | 450000 | — | 3.9 mA |
| Class A1 | 120 V | 2200 | — | — | 5 mA |
Application Notes
Especially designed for use at low supply voltages. Operation range extends from low to very high frequencies.
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