2B7
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BrandRCA
ClassDuplex-Diode Pentode
BaseSmall 7-pin
Filament2.5V @ 800mA
Construction
Primary TypePentode
EnvelopeST-12
SectionsTwo diodes and a pentode
Filament / Heater
Heater NotesA.C. or D.C.
Absolute Maximum Ratings
Audio Performance
Key Features
- Heater type
- Combined detector, amplifier, and automatic-volume-control tube
- Two diode plates around a common cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Unit | - | - | - | - | - |
Application Notes
The 2B7 is intended especially for use in AC receivers having 2.5-volt heater supply. Recommended for service as a combined detector, amplifier (radio-frequency, intermediate-frequency or audio-frequency), and automatic-volume-control tube. Complete shielding of detector circuits is generally necessary to prevent r-f or i-f coupling.
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