1221
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BrandSylvania
ClassPentode
Base6-F
Filament6.3V @ 300mA
Construction
Primary TypePentode
EnvelopeST-12C Long
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation0.75 W
Grid 2 Voltage100 V
Audio Performance
Key Features
- Special non-microphonic construction
- Fixed slope
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 250V | 1225 | 1500000 | 1500 | 2.1mA |
Application Notes
Specifically designed for amplifiers where non-microphonic tubes are required. Electrically identical to type 6C6.
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