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General Electric (GE) 7581A / KT66
General Electric (GE) 7581A / KT66
Regular price
R 1,250.00 ZAR
Regular price
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R 1,250.00 ZAR
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The GE 7581A is a vintage, heavy-duty beam power pentode vacuum tube manufactured in the United States by General Electric. [1, 2]
Key Features and Specifications
- Type: Unipotential-coated cathode beam-power pentode (often cross-referenced or dual-labeled with KT66 or 6L6GC styles). [1, 2]
- Heater: 6.3V at 0.9A. [1]
- Plate Dissipation Rating: 35 watts (compared to 30 watts for a standard 6L6GC). [1, 2]
- Maximum Plate Voltage: 500V (pentode) / 450V (triode). [1]
- Maximum Screen Voltage: 450V. [1]
Common Applications & Characteristics
- Audio & Instrument Amps: Widely used in vintage and modern high-end tube hi-fi amplifiers as well as guitar amplifiers (such as Fender and Ampeg variants) where extra clean headroom and a tighter, more defined low-end response are desired. [1, 2, 3]
- Interchangeability: It is generally a direct drop-in replacement/upgrade for standard 6L6GC, 7581, and KT66 sockets, though circuit biasing should always be verified. [1, 2]
- Sound Profile: Users generally note that the GE 7581A stays cleaner and sharper at higher volumes compared to a standard 6L6GC, offering tighter bass and less early breakup. [1]
Product features
Product features
Materials and care
Materials and care
Merchandising tips
Merchandising tips
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