PEN. DD 4020
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BrandMazda
ClassDouble-Diode Output Pentode
Base7-pin
Filament40V @ 200mA
Construction
Primary TypeOutput Pentode
EnvelopeGlass
SectionsDouble-Diode Pentode
Filament / Heater
Heater NotesIndirectly heated; designed for 0.2A series operation.
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation10 W
Grid 2 Voltage250 V
Audio Performance
Power Output3.9 W
Key Features
- AC/DC Mains operation
- Combined detector, AVC, and output functions
- Common cathode with two separate emitting surfaces
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Operation (185V) | 185V | 7900 | - | - | 29mA |
| Pentode Operation (200V) | 200V | 7900 | - | - | 32mA |
| Pentode Operation (240V) | 240V | 7900 | - | - | 43mA |
Application Notes
The valve must always be self-biased. Grid to cathode circuit resistance should not exceed 1 megohm. A delay voltage of approximately 15V is recommended for AVC circuits. The diode connected to pin No. 3 should be used for AVC bias.
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