Tube-number record
HD22
0 archive entries
HD22 is a tube type in the TubeDatabase archive (class: Double Diode Triode). Recorded specifications: brand Osram, construction Multi-section, base Plastic, socket 5-pin, and maximum plate voltage 150 V. The archive does not yet hold a photographed example of this type.
BrandOsram
ClassDouble Diode Triode
Base5-pin
Construction
Primary TypeMulti-section
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 | 150 V | — | — | 27 | 1.75 mA |
| Triode Section | 125 V | — | — | 27 | 2.3 mA |
| Triode Section | 100 V | 1500 | 18000 | 27 | 1.25 mA |
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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