What sonic gains from 300B tube push-pull config.

I have just purchased a MingDa 300B 4T that is new in the box however it has no tubes or user manual. I contacted Sophia Lee at MingDa Meixing asking for information concerning this amp and what type of tubes it uses. The reply I got back was that they never made a 300B 4T and suggested it could be a copy. Also said that the amp looks like there MC300-A or the MC300-AA they produce but other than that could tell me nothing. I have searched the internet with no luck on this model and this thread so far is the only thing I have found using the 300B 4T model number. Can you give me any information you may have on this amp and tell me what type of tubes it uses, PLEASE. I want to order the correct tubes, get it wired to my Klipsch Cornwalls and then fire this baby up. If you have a user manual I would be more than happy to pay you for a copy plus shipping. The main question is, What Tubes Does It Use. If you or anyone can help with some information that would be great. Thank you, 944turbo