13 D.H.A.
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BrandCossor
ClassDouble Diode Triode
Filament13V @ 0.2mA
Construction
Primary TypeDouble Diode Triode
SectionsTriode and two diodes sharing the same cathode
Filament / Heater
Heater NotesIndirectly heated; designed for A.C./D.C. or D.C. series operation.
Absolute Maximum Ratings
Plate Voltage250 V
Audio Performance
Key Features
- Indirectly heated
- Double diode triode
- Automatic Volume Control
- Sharing the same cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| at Va. 100, Vg. 0 | 100V | 1500 | 83300 | 125 | - |
Application Notes
The valve is intended for Automatic Volume Control. The second diode allows for delay to be applied by a small negative potential to the controlling diode, ensuring sensitivity is not impaired until signal reaches delay voltage.
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