Tube-number record
ECF 86
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BrandMazda Belvu
ClassTriode Pentode
BaseNoval (B9A)
Filament6.3 V @ 390 mA
Construction
Primary TypeMulti-section
EnvelopeA22-2
Base MaterialGlass
Sections2
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage150 V
Cathode Current18 mA
H-C Voltage100 V
Audio Performance
Key Features
- V.H.F. frequency changer
- Low noise
- Indirectly heated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode | 170 V | 12000 | 350000 | 70 | 10 mA |
| Triode | 100 V | 5700 | — | 17 | 14 mA |
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