1229
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BrandSylvania
ClassFilamentary tetrode electrometer tube
BaseSmall 4-Pin
Construction
Primary Typetetrode
EnvelopeST-12
Base MaterialPhenolic
Filament / Heater
Absolute Maximum Ratings
Audio Performance
Key Features
- exceptionally low grid current
- electrostatic shielding
- light shielding
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| DC Voltage Amplifier | 45V | - | - | - | 0.00033mA |
Application Notes
Tube shielded from all light and external electrical influences.
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