7AF7
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BrandSylvania
ClassDouble Triode Amplifier
BaseLock-In 8 Pin
Filament7V @ 0.32mA
Construction
Primary TypeTriode
EnvelopeT-9
SectionsDouble
Filament / Heater
Heater NotesNominal rating; typical operation at 6.3V / 0.300A
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
H-C Voltage90 V
Audio Performance
Key Features
- Single-ended duo triode
- Separate cathode connections
- Lock-In base structure
- Low interelectrode capacities
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A, Per Section | 100V | 2600 | 6500 | 17 | 10.8mA |
| Class A, Per Section | 100V | 1900 | 8400 | 16 | 5mA |
| Class A, Per Section | 250V | 2100 | 7600 | 16 | 9mA |
Application Notes
Designed for use as a phase inverter or voltage amplifier. Performance characteristics are similar to Type 7N7 but with lower interelectrode capacities.
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