6B7
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BrandRCA
ClassDuplex-Diode Pentode
BaseSmall 7-Pin
Filament6.3V @ 300mA
Construction
Primary TypeHeater
EnvelopeST-12
Base MaterialSmall Metal
SectionsTwo Diodes, One Pentode
Filament / Heater
Heater NotesA.C. or D.C.
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage125 V
Audio Performance
Key Features
- Heater type
- Combined detector, amplifier, and automatic-volume-control
- Suppressor connected to cathode within bulb
- Two diode units with common cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Unit - Class A1 Amplifier | 100V | 930 | 300000 | 285 | 5.8mA |
| Pentode Unit - Class A1 Amplifier | 180V | 840 | 1000000 | 840 | 3.4mA |
| Pentode Unit - Class A1 Amplifier | 250V | 1000 | 800000 | 800 | 6mA |
| Pentode Unit - Class A1 Amplifier | 250V | 1125 | 650000 | 730 | 9mA |
Application Notes
The total resistance in the grid circuit of the 6B7 should be limited to 1.0 megohm. Complete shielding of detector circuits is generally necessary to prevent r-f or i-f coupling.
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