Tube-number record
6KR8-A
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BrandGeneral Electric
ClassTriode-Pentode
BaseNoval (B9A)
Filament6.3 V @ 750 mA
Construction
Primary TypeMulti-section
EnvelopeT-6 1/2
Base MaterialGlass
SectionsMedium-mu triode and sharp-cutoff pentode
Filament / Heater
Heater NotesHeater voltage +/- 10%
Absolute Maximum Ratings
Plate Voltage330 V
Plate Dissipation4 W
Grid 2 Voltage330 V
H-C Voltage100 V
Audio Performance
Key Features
- Miniature construction
- Unilaterally interchangeable with 6KR8
- Sharp-cutoff pentode for video amplifier
- Medium-mu triode for general purpose
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section (Check 1) | 35 V | — | — | — | 54 mA |
| Pentode Section (Check 2) | 200 V | 20000 | 60000 | — | 19.5 mA |
| Triode Section | 125 V | 10400 | 4400 | 46 | 15 mA |
Application Notes
The pentode is intended for use as a video amplifier and the triode for general-purpose use.
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