Tube-number record
CF7
0 archive entries
ClassPentode
Filament13 V @ 200 mA
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
H-C Voltage125 V
Audio Performance
Key Features
- H.F. Penthode
- Low microphony
- Indirectly heated
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| H.F. Pentode | 200 V | 2100 | 2000000 | 4000 | 3 mA |
| H.F. Pentode | 100 V | 2100 | 700000 | 1500 | 3 mA |
Application Notes
Commonly used as an anode-bend rectifier or LF amplifier. For high sensitivity detector use, screen grid voltage should be derived via potentiometer. Identical to AF7 except for heater data.
0 results