Good quality KT88 power tubes?

The best KT88's I have used over the years are Genelex Gold Lion. They are to KT88 what Western Electric is to 300B. For smoothness and musicality while retaining definition and punch I have heard NOTHING to compare.

I will chime in with another reccomendation for Kevin at Upscale audio and his choice of KT90s.

Had the Sovteks in a pair of Quicksilvers. Indeed they are not good sounding tubes. Bought a set of Aeros and they are quite an improvement. Reasonable price was a factor also. I am not disappointed in them although I have heard good things about the KT-90 also.

I suggest you check with the designer of your amp, and see if you can substitute other tubes in place of the KT88. Possible alternatives (beyond the KT90 already suggested) are, 6550, 5881, and 6L6. Old stock American tubes (used, good) are superb, such as the Tung Sol 6550 and 5881. Many designs that use KT88 can use these tubes. Old stock American tubes can often be found at Antique Electronics in Arizona. The comments about the Genelex Gold Lion are absolutely correct, but they will be (probably) over $150.00 each tube, maybe much more. Good used US Military 5881 show in Antiques catalog at only $17.00. If you must only use KT88, listen to the Tesla KT88, or even the Svetlana 6550, I think that both of these are better than the Sovtec.

Albert, your right about checking with the manufactuers on what tubes can be used with there amps. my amp can use the the kt88 6550 kt90 kt100 [Rogue 88 ] they use the sovtek kt88 because it a good tube thats reliable, but they do like the sound of the tubes from Penta labs kt 88, they sound WAY better than the sovtek, Also Svetlanta has a new kt 88 comming out too! greg