Tube-number record
12A5
0 archive entries
12A5 is a tube type in the TubeDatabase archive (class: Power Amplifier Pentode). Recorded specifications: brand Sylvania, construction Pentode, socket 7-pin (non-miniature), maximum plate voltage 180 V, and maximum plate dissipation 8.25 W. The archive does not yet hold a photographed example of this type.
BrandSylvania
ClassPower Amplifier Pentode
Base7-pin (non-miniature)
Filament6.3 V @ 0.6 mA
Construction
Primary TypePentode
EnvelopeST-12
SectionsSingle
Filament / Heater
Heater NotesFilaments can be connected in series (12.6V/0.3A) or parallel (6.3V/0.6A).
Absolute Maximum Ratings
Plate Voltage180 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A1 | 100 V | 1700 | 50000 | — | 7 mA |
| Class A1 | 180 V | 2400 | 35000 | — | 45 mA |
Application Notes
Recommended DC grid circuit resistance below 0.5 Megohms for fixed bias, or 1.0 Megohm for auto-bias. In automobile applications, 2.2W output can be achieved with 36mA cathode current for economy.
Datasheets
Datasheet: 12A5.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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