I use the tubestore "preferred" (Shuguang) 274b tubes in my Had Firebottle because they look so cool. They seem to work very well but mostly...hey...it's the look.
5ar4 rectifier tube
I’m buying some backup 5ar4’s for my primaluna evo 100 preamp. Upscale audio’s website says the Gold Lion isn’t suitable for this preamp. I like Gold Lion but there’s no explanation why. There’s only one other choice on their site. I also like Upscale audio. Advise is appreciated..