Tube-number record
DBC 21
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BrandPhilips
ClassDuodiode-triode
BaseRimlock
Construction
Primary TypeTriode
EnvelopeGlass
Sections1 triode, 2 diodes
Filament / Heater
MaterialOxide-coated
Absolute Maximum Ratings
Plate Voltage135 V
Plate Dissipation0.3 W
Grid 1 Voltage-0.2 V
Cathode Current3 mA
Audio Performance
Key Features
- Directly heated
- Battery-powered
- Internal shielding between triode and diode systems
- Two separate filaments (2x25mA) connected in parallel
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Static Operation (90V) | 90 V | 850 | 30000 | 25 | 1.4 mA |
| Static Operation (120V) | 120 V | 900 | 28000 | 25 | 1.6 mA |
Application Notes
Used as a detector and LF amplifier tube. Suitable for both resistance and transformer coupling. Designed for use with battery-operated radio sets, often followed by a DLL 21 balanced output stage.
Datasheets
Datasheet: DBC21.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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