Tube-number record
TDO3-10
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BrandMullard
ClassDisc Seal Triode
BaseCoaxial
Filament6.3 V @ 0.4 mA
Construction
Primary TypeTriode
EnvelopeMetal-glass Disc Seal
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation10 W
Cathode Current50 mA
Audio Performance
Key Features
- Indirectly-heated
- Disc seal construction
- No internal feedback
- Common grid
- Earthed anode
- Concentric line oscillator
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Oscillator/Amplifier | 250 V | 6000 | 5000 | 30 | 20 mA |
Application Notes
Primarily intended for use as a common grid, earthed anode, concentric line oscillator. To limit anode seal temperature, the mass of metal in thermal contact with the anode disc must not be less than 60 grams of brass or thermal equivalent.
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