HL/DD.1320
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BrandMazda
ClassDouble Diode Triode
Base7-pin
Filament13V @ 200mA
Construction
Primary TypeIndirectly heated double diode triode
EnvelopeMetallised
SectionsTriode, 2 Diodes
Filament / Heater
Heater NotesSuitable for D.C., A.C./D.C. Mains, or car radio receivers
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- Metallised bulb
- Diode section screened from triode section
- High resistance between heater and cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Section | 100V | 2000 | 15000 | 30 | - |
Application Notes
Designed to operate as a combined detector-amplifier with or without A.V.C. Suitable for amplified A.V.C. circuits where the triode unit acts as a combined audio-frequency amplifier and D.C. amplifier. One diode anode (Pin 1) typically for audio frequency detection and Pin 3 for A.V.C. voltage.
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