Tube-number record
DAC 22
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DAC 22 is a tube type in the TubeDatabase archive (class: Signal Tube). Recorded specifications: brand Philips, year 1941, construction Vacuum Tube, maximum plate voltage 135 V, and maximum plate dissipation 0.1 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassSignal Tube
Construction
Primary TypeVacuum Tube
EnvelopeGlass
SectionsDiode-Triode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage135 V
Plate Dissipation0.1 W
Grid 1 Voltage-0.4 V
Cathode Current1 mA
Audio Performance
Key Features
- Direct heating
- Battery operation
- Low filament current (25mA)
- Diode-triode for LF amplification
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 90 V | 400 | 130000 | 40 | 0.3 mA |
| Triode section | 120 V | 500 | 110000 | 40 | 0.6 mA |
Application Notes
Designed for L.F. amplification with resistance coupling. Suitable for series or parallel filament supply.
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