clean and clear but microphonic
I put these in the preamp for Deluxe Reverb RI They were extremely microphonic. I could hear tink clank while just plugging in my guitar cord. The spring loaded tube covers helped quiet the tubes a little. But still microphonic. I put one in my Super Champ and behold very little to no microphonics. I like the non-coloring tone of these tubes clean and clear, but depends on whether they will like your amp.