Tube-number record
AC/HL. DD
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BrandMazda
ClassDouble Diode Triode
Base7-pin (non-miniature)
Filament4 V @ 1000 mA
Construction
Primary TypeIndirectly heated
EnvelopeMetallised
SectionsDouble Diode Triode
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Indirectly heated double diode triode
- Combined detector amplifier and automatic volume control valve
- Diodes screened from triode section
- Metallised bulb
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation | 100 V | 2600 | 13800 | 36 | — |
Application Notes
Resistance between heater and cathode is of a very high order. Suitable for amplified A.V.C. circuits. Detector diode load should be high, approximately 0.5 to 1 megohm.
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