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Great sounding tubes. Excellent build quality. One thing that you need to make sure of is that your amp has enough of a bias sweep to accept these tubes. I like to experiment with different tubes in my amps for a tone change. Sometimes you get a negative result, you just never really know how your amp will react. I could not be happier with these KT66's. The amp opened up quite a bit.
Verified purchase: Yes
I must say, a new KT-88 made by RCA, Sylvania or GE would have a very tough time competing with the set I got made by Genalex. Excellent tubes, and would recommend to others to buy them here if you needed them. Sound quality is superb. Couldn't expect more.
Verified purchase: No
phase inverter tube weak and noisy . not worth returning. kt66s sound good with good matching and stability. no rattle.
Verified purchase: Yes
Excellent tubes, great sound in my amplifiers.
Verified purchase: Yes
excellent tube
Verified purchase: Yes