Tube-number record
7L7
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BrandTung-Sol
ClassPentode
BaseLoctal
Filament6.3 V @ 300 mA
Construction
Primary TypeOther / special
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) | 100 V | 3000 | 100000 | — | 5.5 mA |
| Class A1 Amplifier (250V) | 250 V | 3100 | 1000000 | — | 4.5 mA |
Application Notes
Useful as an IF amplifier or limiter in FM equipments.
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