Tube-number record
7F8W
0 archive entries
7F8W is a tube type in the TubeDatabase archive (class: Rugged High Transconductance Double Triode). Recorded specifications: brand Sylvania, year 1952, construction Dual triode, base Lockin, socket Loctal, maximum plate voltage 300 V, and maximum plate dissipation 3.5 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassRugged High Transconductance Double Triode
BaseLoctal
Filament6.3 V @ 300 mA
Construction
Primary TypeDual triode
EnvelopeT9
Base MaterialLockin
Sections2
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Each Section) | 250 V | 5200 | — | 50 | 10.5 mA |
Application Notes
Designed for use in applications requiring resistance to shock and vibration.
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