The Genalex Gold Lion KT66 Platinum matched power tubes provide the tone that defined an era. Recreating the sound of early Marshall amps, these tubes deliver Eric Clapton's iconic "Bluesbreaker" tone with improved bass response and articulation. You'll get rich harmonics and a chimey top end that cuts through the mix. Originally designed as a British alternative to 6L6 tubes, the KT66 is a mainstay of Hi-Fi and guitar amps. With their vintage-correct construction, these Genalex tubes take you back to the golden age of rock. Their full, balanced sound works for any genre. Experience the tone that launched a thousand solos.