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GEC KT66 NOS tubes - No Boxes
GEC KT66 NOS tubes - No Boxes
Regular price
R 3,500.00 ZAR
Regular price
Sale price
R 3,500.00 ZAR
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Low stock: 7 left
GEC KT66 NOS tubes - No Boxes, tested within 5% of specification.
The KT66 is a beam power tetrode vacuum tube introduced by the Marconi-Osram Valve Company (M-OV) in 1937, famous for combining the efficiency of a power pentode with the low-distortion linearity of a triode. [1, 2]
Overview & History
- Design: It uses two internal beam-forming plates tied to the cathode to eliminate the performance "kink" found in early tetrodes without needing a separate suppressor grid pin. [1, 2]
- Classic Uses: It became a cornerstone of British high-fidelity and instrument amplification, powering legendary gear such as the Quad II hi-fi amplifier (1953), the Williamson amplifier (1947), and vintage Marshall JTM45 "Bluesbreaker" guitar amps. [1, 2, 3, 4]
- Sonic Profile: Known for a warm, thick midrange, deep and clean bass, smooth top-end chime, and an aggressive character when overdriven. [1, 2, 3, 4, 5, 6]
Compatibility & Substitution
- 6L6GC / 5881 Relationship: The KT66 is often used as a direct or near-equivalent substitute for the American 6L6GC family, though it has a larger physical glass envelope and traditionally draws a higher heater/filament current (around 1.3A vs. 0.9A for standard 6L6 types, depending on the manufacturer). [1, 2, 3, 4, 5]
Product features
Product features
Materials and care
Materials and care
Merchandising tips
Merchandising tips
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