JJ KT66The new JJ KT66 tube from JJ Electronic. This KT66 tube is rated to handle 550V of plate voltage and screen voltage. If your amp has “bear trap” tube retainers they will have to go because of the size of the tube's base but also the bear trap clamp will ground the metal base to the chassis and cause a malfunction. From our review: ".... the glass bottle on my sample was very thick and well formed. The tone is very balanced and centered around some thick warm midrange tones. It handles high and lower voltages on the plates equally with no problems biasing." View the JJ KT66 tube data sheet. 
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