D3A
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BrandSiemens
ClassWideband Pentode
BaseNoval
Filament6.3V @ 315mA
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated, parallel supply
Absolute Maximum Ratings
Plate Voltage220 V
Plate Dissipation4.2 W
Grid 2 Voltage180 V
Grid 1 Voltage-10 V
Cathode Current30 mA
H-C Voltage60 V
Audio Performance
Typical THD0.4%
Power Output0.42 W
Key Features
- Long life
- High reliability
- Tight tolerances
- Interface-layer-free special cathode
- High transconductance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 190V | 35000 | 120000 | 80 | 22mA |
| Triode | 160V | 41000 | 1900 | 77 | 24mA |
Application Notes
Specifically designed for wideband amplifiers in telecommunications, ZF and coaxial cable amplifiers, and pulse amplifiers.
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