HL.21/DD
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BrandMazda
ClassBattery Double Diode Triode
BaseStandard 5-pin base with top cap
Construction
Primary TypeDouble Diode Triode
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 | 100V | 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.
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