So a while ago, i ordered a whole retube, power and pre for my Dual Caliber 5. I got a set of Tungsol 12ax7s, and two Ruby Tubes 6l6gcs.
I replaced the preamp tubes with the tungsols and they sounded great. Replaced the groove tubes that were in the power section with the rubys and i didnt like them. A month ago, i pretty much nailed the settings on my amp to 99% perfect, and though to try the rubys again. The difference was good, its much more creamier in the mids department, more musical and not as just "there", and there is less bass but in a good way, because the bass is much more defined now. The treble is also lessened which i like. not so much lessened as there is more low-treble, less high-treble and more presence.
I replaced the preamp tubes with the tungsols and they sounded great. Replaced the groove tubes that were in the power section with the rubys and i didnt like them. A month ago, i pretty much nailed the settings on my amp to 99% perfect, and though to try the rubys again. The difference was good, its much more creamier in the mids department, more musical and not as just "there", and there is less bass but in a good way, because the bass is much more defined now. The treble is also lessened which i like. not so much lessened as there is more low-treble, less high-treble and more presence.