Tube-number record
1B5/25S
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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
Audio Performance
Key Features
- Filament type
- Contains two diodes and a triode in a single bulb
- Independent diodes (common filament)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 Amplifier | 135 V | 575 | 35000 | 20 | 0.8 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.
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