Tube-number record
6B7
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6B7 is a tube type in the TubeDatabase archive (class: Duplex-Diode Pentode). Recorded specifications: brand RCA, construction Other / special, base Small Metal, socket 7-pin (non-miniature), and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandRCA
ClassDuplex-Diode Pentode
Base7-pin (non-miniature)
Filament6.3 V @ 300 mA
Construction
Primary TypeOther / special
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 | 100 V | 930 | 300000 | 285 | 5.8 mA |
| Pentode Unit - Class A1 Amplifier | 180 V | 840 | 1000000 | 840 | 3.4 mA |
| Pentode Unit - Class A1 Amplifier | 250 V | 1000 | 800000 | 800 | 6 mA |
| Pentode Unit - Class A1 Amplifier | 250 V | 1125 | 650000 | 730 | 9 mA |
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.
Datasheets
Datasheet: 6B7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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