Tube-number record
12H4
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BrandSylvania
ClassMedium Mu Triode
BaseMiniature 7-pin (B7G)
Filament12.6 V @ 150 mA
Construction
Primary TypeTriode
EnvelopeMiniature
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesSeries/Parallel operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.5 W
H-C Voltage90 V
Audio Performance
Key Features
- Miniature
- General purpose
- Medium mu
- Coated Unipotential Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation (Condition 1) | 90 V | 3000 | 6700 | 20 | 10 mA |
| Typical Operation (Condition 2) | 250 V | 2600 | 7700 | 20 | 9 mA |
Application Notes
Except for basing and heater operation, the Type 12H4 is identical to the Type 12G4. It is also similar to one section of a Type 12SN7GT.
Datasheets
Datasheet: 12H4.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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