I used those tubes from Upscale in my Rogue ST-100, I really liked them and would swap with some Telefunken's, they both gave a nice contrast and kept things interesting. I thought the Brimars had a really nice tone and the telefunkens were a little more dynamic. On the Rogue, I believe these tube were the phase inverters, Rogue told me the phase inverter tubes had the biggest impact on the sound in their amp. For what that's worth.
Tube Rolling
Hi Guys, I am going to be tube rolling very soon with my Primaluna Evo 300 Pre-amp & Primaluna Evo 400 Power amp, Has anyone tried the new Brimar CV4003 / 12AU7 / 6189 for the gain tubes and the TAD KT88’s- STR Redbase for the power tubes ?
Many Thanks
Steve.