General Electric
General Electric 6678 (rugged) 6U8A New Old Stock Vacuum Tubes Sleeve of 5
- MPN:
- 6678
- Condition:
- New
- Shipping:
- Free Shipping
Description
General Electric 6678 (rugged) 6U8A New Old Stock Vacuum Tubes Sleeve of 5
This Sleeve of 5 tubes are new old stock and guaranteed full emission.
Shipping is free in the USA
The 6678 is a miniature dual-section vacuum tube combining a medium-mu triode and a sharp-cutoff pentode, designed primarily for mobile communications equipment where supply voltage can vary significantly (e.g., in automotive radios or CB transceivers). Produced in the 1960s–1970s by manufacturers like General Electric (GE), Sylvania, and RCA, it's electrically equivalent to the 6U8/6U8A (with the 6678 designation indicating ruggedized construction for wider filament voltage tolerance: 6.3V ±20%, or 5.04–7.56V). This makes it more resilient to voltage fluctuations than standard 6U8A tubes
Key SpecificationsBased on GE and RCA datasheets:
|
Parameter |
Value/Description |
|
Type |
Triode-pentode (medium-mu triode + sharp-cutoff pentode) |
|
Filament Voltage |
6.3 V (±20% for mobile use) |
|
Filament Current |
0.3 A |
|
Triode: Plate Voltage (Max) |
300 V |
|
Triode: Plate Dissipation (Max) |
2.0 W |
|
Pentode: Plate Voltage (Max) |
300 V |
|
Pentode: Plate Dissipation (Max) |
3.0 W |
|
Pentode: Screen Voltage (Max) |
150 V |
|
Pentode: Grid Voltage (Max, Negative Bias) |
-10 V |
|
Transconductance (Triode, Typical) |
1,600 µmhos |
|
Transconductance (Pentode, Typical) |
3,500 µmhos |
|
Amplification Factor (Triode) |
20 |
|
Amplification Factor (Pentode) |
40 |
|
Base |
9-pin miniature (B9A/Noval) |
|
Envelope |
Glass, T-6½ shape (miniature) |
|
Getter Types |
Typically halo or O-getter (varies by brand) |
|
Typical Applications |
RF oscillator/mixer in mobile radios, FM tuners, IF amplifiers; sub for 7199 in high-voltage circuits |
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