7L7
0 Tubes in archive
BrandTung-Sol
ClassPentode
BaseLoctal
Filament6.3V @ 300mA
Construction
Primary TypeTriple grid sharp cut-off high transconductance amplifier
EnvelopeGlass
Base MaterialLock-in
SectionsSingle
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 2 Voltage125 V
H-C Voltage90 V
Audio Performance
Key Features
- Sharp cut-off
- High transconductance
- Lock-in construction
- Triple grid
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier (100V) | 100V | 3000 | 100000 | - | 5.5mA |
| Class A1 Amplifier (250V) | 250V | 3100 | 1000000 | - | 4.5mA |
Application Notes
Useful as an IF amplifier or limiter in FM equipments.
Sort by
Showing 1 to 0 of 0 results