UF85
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BrandPhilips
ClassR.F. Pentode
BaseNoval (B9A)
Filament19V @ 100mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirect by A.C. or D.C.; series supply
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage250 V
Grid 1 Voltage-1.3 V
Cathode Current15 mA
H-C Voltage150 V
Audio Performance
Key Features
- Variable mutual conductance
- Broadband amplifier suitability
- Indirect heating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| R.F. or I.F. amplifier (Mode 1) | 100V | 5000 | 250000 | - | 5.5mA |
| R.F. or I.F. amplifier (Mode 2) | 170V | 5900 | 300000 | - | 9.7mA |
| R.F. or I.F. amplifier (Mode 3) | 200V | 6100 | 350000 | - | 11.4mA |
Application Notes
Designed for use as I.F. amplifier in A.M. receivers and as R.F. or I.F. amplifier in F.M. receivers or broadband amplifiers.
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