Tube-number record
D3A
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BrandSiemens
ClassWideband Pentode
BaseNoval (B9A)
Filament6.3 V @ 315 mA
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 | 190 V | 35000 | 120000 | 80 | 22 mA |
| Triode | 160 V | 41000 | 1900 | 77 | 24 mA |
Application Notes
Specifically designed for wideband amplifiers in telecommunications, ZF and coaxial cable amplifiers, and pulse amplifiers.
Datasheets
Datasheet: D3a.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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