Tube-number record
XCH 81/3AJ8
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BrandIBRAPE (Miniwatt)
ClassTriode-Heptode
BaseNoval (B9A)
Filament3.6 V @ — mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Sections2
Filament / Heater
Warm-up Time11s
Heater NotesIndireto, alimentacao em série (A.C. ou D.C.)
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1.7 W
Grid 2 Voltage125 V
Grid 1 Voltage-1.3 V
Cathode Current12.5 mA
H-C Voltage150 V
Audio Performance
Power Output0.05 W
Key Features
- Misturadora
- Amplificadora RF/FI
- Triodo-Heptodo
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Heptode Misturadora | 250 V | 750 | 1000000 | — | 3.25 mA |
| Heptode Amplificadora RF/FI | 250 V | 2400 | 700000 | — | 0.5 mA |
| Triode Caracteristicas Tipicas | 100 V | 3700 | — | 22 | 13.5 mA |
Application Notes
A secao heptodo pode ser usada sem precaucoes especiais contra efeitos microfonicos em circuitos onde Vi=50mV para saida de 50mW.
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