6SN7 driver tubes

For 20 per tube, try the Tungsol 6SN7 reissue

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.

I wrote an assay wich went somewhere. The upshot is . IMHO the Sylvanias are my favorites especially the chrome heavy T plates that are directly opposed with 3 rivets.
Brent Jesse of AudioTubes.com can set you up with true NOS tubes for $20 each,or thereabouts anyway. In your price range.
Usually RCA and sometimes later GE niether of which are that great.He may have some OEM Philco or Admiral etc. Sylvania true chrome dome, top getter, T plates,however. They excell in balanced extension and are a great 3D sound staging tubes.
I have heard that the russian tube is a world beater, but only the real deal old stock tubes. I have also heard their noise floor tends to be high. With drivers that usually doesn't matter. The tube you choose though, will alter the sound even in the driver spot.
If you go for the Russian tube be careful who you buy them from. The seller should know what he is doing and know the other choices.
If you send me an email I will give you a long list of what I think the outstanding attributes are,for the various commonly encountered 6SN7s.