Tube-number record
12A4
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12A4 is a tube type in the TubeDatabase archive (class: Medium-Mu Triode). Recorded specifications: brand Hytron, construction Triode, socket Noval (B9A), maximum plate voltage 500 V, and maximum plate dissipation 6.5 W. The archive does not yet hold a photographed example of this type.
BrandHytron
ClassMedium-Mu Triode
BaseNoval (B9A)
Filament12.6 V @ 300 mA
Construction
Primary TypeTriode
EnvelopeT-6-1/2
SectionsSingle
Filament / Heater
Heater NotesMay be used in 300 mA series heater circuits or 6.3 volt parallel source.
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation6.5 W
Grid 1 Voltage-50 V
Cathode Current40 mA
H-C Voltage180 V
Audio Performance
Key Features
- High perveance
- Medium-mu triode
- Withstands high peak positive plate potentials
- 300 mA series heater compatible
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A-1 Amplifier | 250 V | 7800 | — | 20 | 21 mA |
| Vertical Deflection Circuit | 250 V | — | — | — | 15 mA |
Application Notes
Specifically intended for use as a vertical deflection amplifier in television receivers with large deflection angles and low plate supply potentials.
Datasheets
Datasheet: 12A4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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