1257
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BrandPhilips
ClassRemote cut-off R.F. pentode and single diode
BaseE8-30
Filament12.6V @ 100mA
Construction
Primary TypeRemote cut-off R.F. pentode and single diode
EnvelopeGlass
Sections2
Filament / Heater
Heater NotesCoated unipotential cathode
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2 W
Grid 2 Voltage250 V
Cathode Current10 mA
H-C Voltage150 V
Audio Performance
Key Features
- Remote cut-off
- Single diode
- Internal shield
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section | 200V | 2000 | 1000000 | 18 | 5mA |
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.
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