Tube Rolling

The NOS Brimar CV4003 has a moderate amount of warmth with extension up top and in the bass. Not as warm as Mullard, but is more detailed. I’ve used them in preamp gain stages and also in my amps.

Brent Jesse is a great dealer, but the CV4003s from Upscale are low noise and have lasted for years. Just so there's no confusion with other tubes, these have box-plates.

+1 Brent Jessee

Great selection of tubes, extremely knowledgeable, and will give an honest opinion.....buy with confidence

Brent Jesse’s site is a fantastic resource of information.  When you want a little info on a tube’s characteristic sound it’s there. He himself has always been helpful to me in finding uncommon tubes that he didn’t even know existed.  
whenever somebody asks me what a certain tube sounds like I tell them to look up his site.  

Great info 12AU7...

https://www.audiotubes.com/12au7.htm

+2 for Brent

Brent Jesse is the best! And yes I have used the Brimar NOS CV4003 tubes in my Primaluna and its a nice upgrade.