PCF805
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BrandBrimar
ClassTriode Pentode
BaseB9A
Filament7.4V @ 0.3mA
Construction
Primary TypeTriode Pentode
EnvelopeGlass
Base MaterialCeramic (holder note)
Sections2
Filament / Heater
Heater NotesSeries string operation
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage230 V
Cathode Current18 mA
H-C Voltage200 V
Audio Performance
Key Features
- Variable mu pentode
- Frame grid construction
- High gain controlled I.F. amplifier following U.H.F. tuner
- Basing arranged to minimise pentode cathode lead inductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Characteristics | 125V | 11000 | - | 50 | 10mA |
| Triode Characteristics | 100V | 5500 | - | 17 | 14mA |
| Pentode as I.F. Amplifier | 125V | 15200 | - | - | 13.2mA |
Application Notes
The pentode section is intended for use as a variable gain V.H.F. frequency changer or high gain controlled I.F. amplifier.
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