6DR8
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BrandRogers Electronic Tubes & Components
ClassDouble-diode-pentode
BaseE 9-1
Filament6.3V @ 300mA
Construction
Primary TypeDouble-diode-pentode
EnvelopeTt 6 1/2
Base MaterialGlass
SectionsDouble diode, single pentode
Filament / Heater
Heater NotesOperated directly from a storage battery
Absolute Maximum Ratings
Plate Voltage50 V
Grid 2 Voltage50 V
H-C Voltage50 V
Audio Performance
Key Features
- Low voltage operation
- Internal shield
- Unipotential cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| I.F. amplifier | 25V | 2100 | 200000 | - | 1.7mA |
| I.F. amplifier | 12.6V | 1000 | 1000000 | - | 0.45mA |
| I.F. amplifier | 6.3V | 450 | 650000 | - | 0.12mA |
Application Notes
Double-diode-pentode for use as I.F. amplifier, detector and for automatic gain control in car-radio sets to be operated directly from a storage battery. Grid No. 1 bias obtained by grid current biasing with a grid No. 1 resistor of 2.2 megohms.
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