Brimar vs Mullard cv4003/12AU7

Old thread, but I’ve tried both in a rogue sphinx v2. For me, the mullard’s sounded better...more holographic. They both have good dynamic range and are quiet in my system, but after using the Brimars for a while, I switched back to the Mullards. I’m thinking it might be system dependent though

@bradbort , yes it's system dependent. I'll add that it's component dependent.
I used Mullard longplate square getters from the 1950's for years in a preamp. Also used a Mullard CV4004 as an input tube in my amp.
When I changed to a new amp, I needed more clarity and extension, and the Brimars were a better fit.

I preferred the Brimars on an Octave V80SE integrated.  They were nothing short of glorious.