JJ Electronics Amplifier Tube (T-KT66-JJ-MP) Octal power tube (Max Plate Watts = 25W), This Slovakian tube is tight and punchy with a more straightforward mid body than its 6L6GC cousin The highs are also more subtle than those of the 6L6GC In overdrive, it is tight and hard driving with glassy highs. Available in singles, Apex Matched Pairs and Apex Matched Quads