Tube-number record
EL81
0 archive entries
EL81 is a tube type in the TubeDatabase archive (class: Output Pentode). Recorded specifications: brand Philips, construction Pentode, socket Noval (B9A), and maximum plate voltage 315 V. The archive does not yet hold a photographed example of this type.
BrandPhilips
ClassOutput Pentode
BaseNoval (B9A)
Filament6.3 V @ — mA
Construction
Primary TypePentode
EnvelopeGlass
Filament / Heater
Heater NotesMeasured at 6.15V to 6.45V in circuit
Absolute Maximum Ratings
Plate Voltage315 V
Grid 2 Voltage159 V
Audio Performance
Power Output40 W
Key Features
- Used in EL 6411 amplifier
- Parallel push-pull configuration
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Idle (Nullast) | 306 V | — | — | — | 17.5 mA |
| Full Load (Vollast) | 271 V | — | — | — | 68 mA |
Application Notes
The EL81 is used in a quad arrangement (B5, B6, B7, B8) for the power stage of the EL 6411 amplifier.
Datasheets
Datasheet: EL81.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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