Tube-number record
9Ф8П
0 archive entries
9Ф8П is a tube type in the TubeDatabase archive (class: Triode-Pentode). Recorded specifications: brand USSR Standard, construction Multi-section, base Glass, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandUSSR Standard
ClassTriode-Pentode
BaseNoval (B9A)
Filament9 V @ 300 mA
Construction
Primary TypeMulti-section
EnvelopeGlass
Base MaterialGlass
Sections2
Filament / Heater
MaterialOxide
Heater NotesSeries connection of heater wires
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 2 Voltage200 V
Cathode Current14 mA
H-C Voltage300 V
Audio Performance
Key Features
- Indirectly heated
- Oxide-coated cathode
- Series heater string compatibility
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode section | 100 V | 5000 | — | 20 | 13 mA |
| Pentode section | 170 V | 6200 | 400000 | — | 10 mA |
Application Notes
Designed to function as a heterodyne oscillator or high-frequency converter and amplifier in pulse circuits of scanning units of television receivers.
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