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Tube Database (7,341 tube types · 1,270 archive entries)

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6B8 vacuum tube outline illustration

Tube-number record

6B8

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6B8 is a tube type in the TubeDatabase archive (class: Duplex-Diode Pentode). Recorded specifications: brand RCA, construction Other / special, socket Octal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassDuplex-Diode Pentode
BaseOctal
Filament6.3 V @ 300 mA

Construction

Primary TypeOther / special
EnvelopeMetal
SectionsTwo diodes and a pentode

Filament / Heater

Absolute Maximum Ratings

Plate Voltage250 V
Grid 2 Voltage125 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier250 V132560000080010 mA

Application Notes

Recommended for combined detector, amplifier (RF, IF, or AF), and AVC service in radio receivers. The pentode unit features an extended cut-off to permit moderate gain control by grid-bias variation without introducing cross-modulation. Diodes may be used in full-wave or half-wave circuits.

Datasheets

Datasheet: 6B8.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

Filters

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    Audio Performance

    Key Features
    • All-Metal tube construction
    • Two diodes and a pentode in a single envelope
    • Simultaneous detection, amplification, and automatic volume control