Tube-number record
8BQ5
0 archive entries
8BQ5 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand TUNG-SOL, year 1958, construction Pentode, socket Noval (B9A), maximum plate voltage 400 V, and maximum plate dissipation 12 W. The archive does not yet hold a photographed example of this type.
BrandTUNG-SOL
ClassOutput Pentode
BaseNoval (B9A)
Filament8 V @ 0.6 mA
Construction
Primary TypePentode
EnvelopeGlass Bulb
Sections1
Filament / Heater
Heater NotesAC or DC
Absolute Maximum Ratings
Plate Voltage400 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Pentode | 250 V | 11300 | 40000 | 19.5 | 48 mA |
| Class AB Push-Pull (Two Tubes) | 300 V | — | — | — | 36 mA |
| Class A Triode Operation | 250 V | — | — | — | 44 mA |
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