9990 / 401A
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ClassRF Amplifier Pentode
BaseSmall Button Miniature 7-pin, RETMA E7-1
Filament6.3V @ 150mA
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 | 45V | 1900 | - | - | 2.7mA |
| Class A1 | 90V | 2000 | 450000 | - | 3.9mA |
| Class A1 | 120V | 2200 | - | - | 5mA |
Application Notes
Especially designed for use at low supply voltages. Operation range extends from low to very high frequencies.
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