I bought awhile back. I have used it twice in 3 years. Don't even know what I paid for it. It is a BK model 607. All manuals included. Here is some pics. Make me a reasonable offer and it is yours.
Larry
I think new and tubes is an oxymoron. LOL I'll have to look and see. Do you have a specific number. I know it has the cable for the ones that has an electrode on top. I'll get back to you on that. I don't know if it will do 300Bs.