6SN7 driver tubes


I need to replace a few 6SN7 drivers in my amps. They take 3 per side. I've been using Sylvania 6SN7GTB which sound great, but they're pricey to find reliable ones. I've been considering EH or Chinese brown base. Any thoughts on these? Or any other recommendations? I want to keep the cost under $20 per tube.
mingles
If you have been using nos Sylvania's and like the sound,I doubt very seriously that you will be happy with new chinese or russian tubes.I have found the ones I have used(EH,JJ,Ruby,etc.)to have a profound "glare" to the sound.Then again,they might sound just fine to you,you'll never know unless you try them.
In my Modwright Transporter, I have found the Russian 1960's Vintage 6H8C/6SN7 from UpscaleAudio.com work terrifically. Nearly on par with Tung Sol 6SN7GT round plates. In fact, I sold my TS round plates after installing the Russian 6H8C, and I have absolutely no regrets.