Marco_esposito - what TungSol 6550 tube did you try ?
NOS Black Plate/Gray Plate from the 50s-60s or the new production TungSol "reissue" ?
I'm asking this question since those are two very different tubes.
NOS Black Plate/Gray Plate from the 50s-60s or the new production TungSol "reissue" ?
I'm asking this question since those are two very different tubes.