You might like these more. Amperex Bugle Boy 6DJ8/ECC88. NOS tubes with more air.
Herron NOS Tubes
Just wanted to report that I’ve found the Matsuhisa 7DJ8 tube to be a fantastic match for my Herron VTSP-1/166. Huge upgrade from the stock tubes that Keith uses and only $35 each at Upscale. Equal to the big money 6DJ8s I tried. Great tone and sound stage. This change has actually made me reconsider upgrading to Keith's current preamp which I've been saving for. I may just hold on to this one for awhile longer!