Tube-number record
6H8G
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BrandMazda
ClassDouble Diode - Pentode
BaseOctal
Filament6.3 V @ 300 mA
Construction
Primary TypeMulti-section
EnvelopeV5
Sections3
Filament / Heater
Heater NotesCC ou CA
Absolute Maximum Ratings
Plate Voltage250 V
Grid 2 Voltage125 V
Audio Performance
Key Features
- Indirectly heated cathode
- External metallization
- Top cap connection for Grid 1
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A (Example 1) | 100 V | 2000 | 400000 | 800 | 5.5 mA |
| Class A (Example 2) | 100 V | 2100 | 900000 | 1900 | 5.7 mA |
| Class A (Example 3) | 250 V | 2100 | 1100000 | 2300 | 5.7 mA |
Application Notes
The two diodes share a common cathode with the pentode. Used for detection and AVC (Automatic Volume Control) while the pentode serves as an amplifier.
Datasheets
Datasheet: 6H8G.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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