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EL34 vs. KT66 output tubes

I've had the recent opportunity to compare EL34 and KT66 output tubes in my AES sixpac monobloc amps (the amps come with the EL34's). I am surprised how much more I like the KT66's. Male vocals in particular seem to really reach out much more with the KT66's. Although bass might not be as deep as the EL34's, it has a warmer rounder feel. Is the KT66 known to be a warmer sounding tube? Does anyone have experience with both of these tubes?
smeyers

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pkvintage
215 posts
 
https://photos.app.goo.gl/3jdQU89NNsi3REv5A

I have an interesting KT66 based bi-amp single mono block setup that I want to have converted to a 2 channel setup. It came from an organ. The tubes are all old and not NOS and check out very good. I am very interested in you comments as to what I have here and if it is worth spending $800.00 on it to convert. It is very cool looking with a transformer style that I have never seen before. All be it I have to get 2 matched Opt's for it. 
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