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

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85 vacuum tube outline illustration

Tube-number record

85

0 archive entries

85 is a tube type in the TubeDatabase archive (class: Duplex-Diode Triode). Recorded specifications: brand RCA, construction Multi-section, base Small 6-Pin, socket 6-pin, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassDuplex-Diode Triode
Base6-pin
Filament6.3 V @ 0.3 mA

Construction

Primary TypeMulti-section
EnvelopeST-12
Base MaterialSmall 6-Pin
Sections3 (2 diodes, 1 triode)

Filament / Heater

Absolute Maximum Ratings

Plate Voltage250 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A Amplifier135 V750110008.33.7 mA
Class A Amplifier180 V97585008.36 mA
Class A Amplifier250 V110075008.38 mA

Application Notes

The 85 is recommended for performing the simultaneous functions of automatic volume-control, detection, and amplification. The triode unit may be used as a d-c amplifier to supply regulating voltage for a.v.c.

Datasheets

Datasheet: 85.pdf

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

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    Audio Performance

    Power Output0.35 W
    Key Features
    • Heater type
    • Combined detector, amplifier, and automatic-volume-control
    • Common cathode sleeve
    • Independent tube units