Super Premium power beam tetrode & exact copy of the original clear glass KT66, used on vintage english Hi-Fi amplifiers, such as Leak TL12.1, QUAD II, RCA LMI, PYE HF25 and PF91, Dynatron LF612 and more. Used in the early Marshall amps which created Eric Clapton’s “Bluesbreaker Tone”. Full sound with improved bass response and shimmering top-end.

Gold Lion, russian current production tubes