Tube-number record
DH30
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BrandOsram
ClassDouble Diode-Triode
Base7-pin (non-miniature)
Filament13 V @ 300 mA
Construction
Primary TypeMulti-section
EnvelopeCarbonised bulb
Sections3
Filament / Heater
Heater NotesIntended for series or parallel running, 0.3 amp range.
Absolute Maximum Ratings
Plate Voltage200 V
Audio Performance
Key Features
- Indirectly Heated Cathode
- Carbonised bulb
- Optional metallisation
- Double diode and triode on common cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 200 V | — | 18000 | 80 | 2.8 mA |
| Triode section (measurement point) | 100 V | 4500 | — | — | — |
Application Notes
Used as combined Detector, Delayed A.V.C., and L.F. amplification. Suitable for A.C./D.C. receivers or 12-volt car batteries.
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