PCL 805
0 Tubes in archive
BrandTelefunken
ClassTriode/Pentode
BaseNoval
Filament17.5V @ 300mA
Construction
Primary TypeTriode/Pentode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesIndirect heating, connected in series
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation8 W
Grid 2 Voltage250 V
Cathode Current75 mA
H-C Voltage200 V
Audio Performance
Key Features
- Separate cathodes
- Triode as oscillator/pre-amplifier
- Pentode as power stage for vertical deflection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode (Measuring value) | 100V | 5500 | - | 60 | 5mA |
| Pentode (Pulse measurement 1) | 50V | - | - | - | 200mA |
| Pentode (Pulse measurement 2) | 65V | - | - | - | 285mA |
Application Notes
In order to allow for tube tolerances, the circuit must be designed for a maximum rating of the peak anode current of 60% of the characteristic for Ug1 = -1V.
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