Tube-number record
14X7
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14X7 is a tube type in the TubeDatabase archive (class: Twin Diode - High Mu Triode). Recorded specifications: brand National Union, construction Triode, socket Loctal, and maximum plate voltage 300 V. The archive does not yet hold a photographed example of this type.
BrandNational Union
ClassTwin Diode - High Mu Triode
BaseLoctal
Filament12.6 V @ 150 mA
Construction
Primary TypeTriode
EnvelopeT-9
SectionsTriple
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage300 V
Audio Performance
Key Features
- Coated Unipotential Cathodes
- High Mu Triode
- Loktal Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics (Condition 1) | 100 V | 1050 | 62000 | 65 | 0.8 mA |
| Average Characteristics (Condition 2) | 250 V | 1600 | 62500 | 100 | 1.1 mA |
Application Notes
Resistance coupled amplifier Class A. Voltage gain of 38-54 depending on plate supply and load.
Datasheets
Datasheet: 14X7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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