7K7
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BrandSylvania
ClassDuodiode High-Mu Triode
BaseLock-In 8 Pin
Filament7V @ 320mA
Construction
Primary TypeDuodiode High-Mu Triode
EnvelopeT-9
SectionsTriode and Duodiode with separate cathodes
Filament / Heater
Heater NotesNominal ratings; 6.3V and 300mA under typical operation.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
H-C Voltage90 V
Audio Performance
Key Features
- Separate Diode Cathode
- Lock-In base
- High-mu triode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250V | 1600 | 41000 | 70 | 2.3mA |
Application Notes
Differs from usual diode triode by having separate cathodes for diode and triode sections. Triode characteristics are identical to one section of Type 7F7.
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