7687
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BrandSylvania
ClassTriode-Pentode
Base9-Pin Miniature Button (E9-1)
Filament6.3V @ 500mA
Construction
Primary Typetriode-pentode
EnvelopeT6-1/2
Sections2
Filament / Heater
Heater NotesMaximum heater voltage range 5.7-6.9 Volts
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation3 W
Grid 2 Voltage330 V
H-C Voltage200 V
Audio Performance
Key Features
- Low hum
- Low noise
- High Fidelity audio application
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 215V | 2500 | 7200 | 18 | 7.5mA |
| Pentode Section | 220V | 5800 | 500000 | - | 10mA |
Application Notes
The Sylvania Type 7687 is a triode-pentode designed primarily for High Fidelity audio applications. The pentode section is particularly suited to preamplifier service while the triode section is intended for use as a phase splitter.
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