Contact Andy at Vintage Tube Services. He can offer some great recommendations for your equipment. I use him exclusively with great results.
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In my VTL ST-80 I have never found better sounding tubes than the Genelex Gold Lion KT-77's. Unless you need more power I would get another set of the Gold Lion's. Also what makes you think you need new ones. Find a tube tester and check them out. Unless you are just looking to change the sound.