Tube-number record
7J7
0 archive entries
7J7 is a tube type in the TubeDatabase archive (class: Triode-Hexode Converter). Recorded specifications: brand Sylvania, construction Multi-section, base Loktal, socket Loctal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassTriode-Hexode Converter
BaseLoctal
Filament7 V @ 0.3 mA
Construction
Primary TypeMulti-section
EnvelopeT9-G
Base MaterialLoktal
SectionsDual
Filament / Heater
Heater Notes7.0V nominal; 6.3V typical operation
Absolute Maximum Ratings
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Converter (Hexode Section) | 250 V | 310 | 1500000 | — | 1.4 mA |
| Triode Section Only | 150 V | 1350 | 10400 | 14 | 7.5 mA |
| Oscillator Section | 250 V | — | — | — | 5.7 mA |
Application Notes
The 7J7 is a loktal converter composed of a triode and hexode section. It features higher frequency stability compared to other converters, reducing the need for extensive plate filtering. Grid-screen dropping resistors can be eliminated if both sections run at 100V.
Datasheets
Datasheet: 7J7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
0 results