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

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
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1B5/25S vacuum tube outline illustration

Tube-number record

1B5/25S

0 archive entries

1B5/25S is a tube type in the TubeDatabase archive (class: Duplex-Diode Triode). Recorded specifications: brand RCA, construction Multi-section, socket 6-pin, and maximum plate voltage 135 V. The archive does not yet hold a photographed example of this type.

BrandRCA
ClassDuplex-Diode Triode
Base6-pin

Construction

Primary TypeMulti-section
EnvelopeST-12
SectionsTriode and two diodes

Filament / Heater

MaterialFilament Type

Absolute Maximum Ratings

Plate Voltage135 V

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Class A1 Amplifier135 V57535000200.8 mA

Application Notes

Recommended for use as a combined detector, amplifier, and automatic-volume-control tube in battery-operated receivers. Diode plate No. 1 should be used for detection to avoid signal delay effects.

Filters

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Manufacturers

Brands

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    Audio Performance

    Key Features
    • Filament type
    • Contains two diodes and a triode in a single bulb
    • Independent diodes (common filament)