Tube-number record
1L4
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1L4 is a tube type in the TubeDatabase archive (class: Pentode). Recorded specifications: brand Brimar, construction Pentode, socket Miniature 7-pin (B7G), and maximum plate voltage 110 V. The archive does not yet hold a photographed example of this type.
BrandBrimar
ClassPentode
BaseMiniature 7-pin (B7G)
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialDirectly Heated
Absolute Maximum Ratings
Plate Voltage110 V
Grid 2 Voltage90 V
Cathode Current6.5 mA
Audio Performance
Key Features
- Miniature battery
- Low filament current
- R.F. or I.F. amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF/IF Amplifier Operation 1 | 90 V | 930 | 600000 | — | 2.9 mA |
| RF/IF Amplifier Operation 2 | 90 V | 1030 | 350000 | — | 4.5 mA |
Application Notes
Suitable for R.C. coupled A.F. amplifier operation. Grid return should be made to negative filament (pin 1) via a resistance of at least 0.5 meg to minimize variations due to contact potential.
Datasheets
Datasheet: 1L4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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