HD22
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BrandOsram
ClassDouble Diode Triode
Base5-pin
Construction
Primary TypeDouble Diode Triode
EnvelopeGlass
Base MaterialPlastic
Sections3
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Audio Performance
Key Features
- 2-volt Accumulator operation
- Separate filament system for diodes
- Triode fully shielded from diode system
- Automatic Volume Control application
- Carbonised bulb
- Optional metallisation
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 150V | - | - | 27 | 1.75mA |
| Triode Section | 125V | - | - | 27 | 2.3mA |
| Triode Section | 100V | 1500 | 18000 | 27 | 1.25mA |
Application Notes
Designed primarily as a detector and affords an efficient means to effect Automatic Volume Control. Two diode anodes may be strapped for half-wave rectification if AVC is not used.
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