Tube-number record
L.22/DD
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L.22/DD is a tube type in the TubeDatabase archive (class: Battery Double Diode Triode). Recorded specifications: brand Mazda, construction Triode, socket Octal, and maximum plate voltage 150 V. The archive does not yet hold a photographed example of this type.
BrandMazda
ClassBattery Double Diode Triode
BaseOctal
Construction
Primary TypeTriode
EnvelopeGlass
SectionsDouble Diode Triode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Audio Performance
Key Features
- Battery operated
- Metallised bulb
- British Octal Base
- Double diode triode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rating Conditions (Va=100, Vg=0) | 100 V | 1850 | 10000 | 18.5 | — |
| Resistance Coupled (Anode Load 75,000 ohms) | 120 V | — | — | — | 0.6 mA |
| Resistance Coupled (Anode Load 50,000 ohms) | 120 V | — | — | — | 0.8 mA |
Application Notes
The valve is recommended for detection, automatic volume control and audio frequency amplification. Diode load resistance should not be less than 0.5 megohm. Pin No. 1 should be connected to the negative terminal of the L.T. battery.
Datasheets
Datasheet: L22DD.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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