UF89
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BrandPhilips
ClassPentode
BaseNoval
Filament12.6V @ 100mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated; series supply; AC or DC
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.25 W
Grid 2 Voltage250 V
Cathode Current16.5 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable mutual conductance
- High frequency amplifier
- Intermediate frequency amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. or I.F. amplifier | 170V | 4400 | 400000 | 21 | 12mA |
| Operating characteristics (Example 1) | 200V | 3850 | 550000 | - | 11.1mA |
Application Notes
In some cases control grid current may occur; if not permissible, negative grid bias should be increased to at least 1.5 V.
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