Tube-number record
1257
0 archive entries
1257 is a tube type in the TubeDatabase archive (class: Remote cut-off R.F. pentode and single diode). Recorded specifications: brand Philips, construction Pentode, socket Subminiature, maximum plate voltage 250 V, and maximum plate dissipation 2 W. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassRemote cut-off R.F. pentode and single diode
BaseSubminiature
Filament12.6 V @ 100 mA
Construction
Primary TypePentode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesCoated unipotential cathode
Absolute Maximum Ratings
Plate Voltage250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 200 V | 2000 | 1000000 | 18 | 5 mA |
Application Notes
The 1257 is a single diode, remote cut-off R.F. pentode designed for radio frequency applications. It features a design center maximum rating system and a unipotential cathode.
Datasheets
Datasheet: 1257.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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