Tube-number record
5B8
0 archive entries
5B8 is a tube type in the TubeDatabase archive (class: Miniature sharp cutoff pentode and medium mu triode). Recorded specifications: brand Sylvania, construction Pentode, base Small Button 9-Pin (E9-1), socket Noval (B9A), maximum plate voltage 300 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassMiniature sharp cutoff pentode and medium mu triode
BaseNoval (B9A)
Filament4.7 V @ 600 mA
Construction
Primary TypePentode
EnvelopeT6-1/2
Base MaterialSmall Button 9-Pin (E9-1)
SectionsDual
Filament / Heater
Warm-up Time11s
Heater NotesControlled heater warm-up time for series heater string service.
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier (Triode Section) | 200 V | 3300 | 5750 | 19 | 13 mA |
| Class A Amplifier (Pentode Section) | 200 V | 6200 | 300000 | — | 9.5 mA |
Application Notes
The triode section may be used as a low frequency oscillator, sync separator or sync clipper. The pentode section may be used as an IF amplifier, video amplifier or AGC amplifier.
Datasheets
Datasheet: 5B8.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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