Tube-number record
7D7
0 archive entries
7D7 is a tube type in the TubeDatabase archive (class: Heptode-Triode Converter). Recorded specifications: brand Sylvania, construction Triode, socket Loctal, and maximum plate voltage 250 V. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassHeptode-Triode Converter
BaseLoctal
Filament7 V @ 160 mA
Construction
Primary TypeTriode
EnvelopeT-9
Filament / Heater
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage100 V
Audio Performance
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Mixer (Hexode) | 250 V | 275 | 1500000 | — | 1.3 mA |
| Triode Section | 150 V | — | — | 17.5 | 10.5 mA |
Datasheets
Datasheet: 7D7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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