The TAD KT66 is our remake of the great British KT66 by MOV (MO Valve), GEC, Genalex and Gold Lion. This tube is THE REAL THING. It has a large curved glass envelope and a rounded brown base. It made the Marshall JTM45 Plexi amps famous in the 60's and the Quad Hi-Fi amps a legend. Speaking of legends: SRV used the KT66 in his Fender Amps for his outrageous, gigantic guitar sound. Tube height (without pins): approx. 115mm. Recommended: For a full bodied thick tone with larger headroom, smooth but detailed top end, single channel amps, dynamic playing, vintage British Rock and Roll as well as for the new modern vintage amps 2266 and 2466. It can also replace the 6L6GC and 5881 tubes.