The Legendary Old-School Tone!   The TAD KT66 is TAD's 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.   Recommended for a full-bodied, thick tone with more 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.       All power tubes labeled Premium Selected have passed the following tests:   -      Plate Current (PC) and Amplification (TC) -      Low Noise Test -      Microphonic Test -      Sonic Tests -      Shock Tests -      Listening Tests -      Shorts & Leakage Tests   TAD's Premium Matching is an exact matching of power tubes with identical Plate Current (PC) and Transconductance (TC).