Tube-number record
HL.21/DD
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BrandMazda
ClassBattery Double Diode Triode
Base5-pin
Construction
Primary TypeMulti-section
EnvelopeMetallised
SectionsTriode and two independent diodes
Filament / Heater
Absolute Maximum Ratings
Plate Voltage150 V
Audio Performance
Key Features
- Double diode triode for battery operated receivers
- Independent sections
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 100 V | 1500 | 21000 | 32 | — |
Application Notes
Detection, automatic volume control, and audio frequency amplification. Diode at Pin 2 for AVC, Diode at Pin 5 for detection. AVC delay voltage approximately 1.0V.
Datasheets
Datasheet: HL21DD.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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