6H8G
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BrandMazda
ClassDouble Diode - Pentode
BaseOctal
Filament6.3V @ 300mA
Construction
Primary TypeDouble Diode - Pentode
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) | 100V | 2000 | 400000 | 800 | 5.5mA |
| Class A (Example 2) | 100V | 2100 | 900000 | 1900 | 5.7mA |
| Class A (Example 3) | 250V | 2100 | 1100000 | 2300 | 5.7mA |
| Class A (Example 4) | 250V | 2300 | 650000 | 1550 | 8.5mA |
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.
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