It would be nice to hear if there are other sources than Kevin at Upscale since he refuses to sell Amperex 7308 tubes to those of us not resident in the USA. Does anyone know of another source?
Tube upgrades for SF Line Preamp
I recently purchased Sonic Frontier line preamp and upgraded the standard 6922 tubes to valvo tubes. Like most audiophile, I am needlessly spending more money hoping to achieve that 1% increase in sound reproduction. Does anyone know what other tubes I can upgrade to in order to get me to that next level?