KT66

The KT66 is the predecessor to the KT88, also developed by GEC/MOV, with a lower plate dissipation (~25W) and a warmer, more romantic sonic character. It was the output tube of the original Marshall JTM45 and the Williamson amplifier, both landmark designs in their respective domains. The KT66 has a sound often described as more triode-like than the KT88, with a lush midrange and gentle top end that flatters acoustic music and vocals. Original GEC KT66s with the clear-glass bottle are extremely rare and expensive; Gold Lion reissues are the most common current production option.