Tube-number record
20D4
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BrandBrimar
ClassTriode-Heptode Frequency Changer
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage300 V
Grid 2 Voltage125 V
Cathode Current17.5 mA
Audio Performance
Key Features
- High conversion conductance
- Noval (B9A) base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode Characteristics | 250 V | 2800 | 900000 | — | 7 mA |
| Triode Characteristics | 100 V | 3500 | — | 16 | 15 mA |
| Frequency Changer | 250 V | 850 | — | — | 3 mA |
Application Notes
The BRIMAR 20D4 is a triode-heptode frequency changer on the Noval (B9A) base, featuring very high conversion conductance.
Datasheets
Datasheet: 20D4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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