http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html This site has a lot of information and Joe reviews a lot of different NOS tubes. As Elizabeth said it can be fun and really frustrating chasing the best tubes. You may want to get used to the amp first and do some reading. It might also be good for the amp to burn in and make sure everything is settled. Maybe a few hundred hours? Then take a chance and see what you get
Tube recomendations for a newbie
I have just purchased a Mingda Mei Xing tube intergrated amplifier. I live in Shanghai, China. I'm new to tubes and the amp is supplied with Chinese tubes. I'm wondering if swapping tubes on this amp will provide better sound quality? If so, any recommendations? I believe the tube configuration is: EL34 x4(JJ)、12AU7 x2、12AX7 x2. The system will play mostly jazz, classical, reggae. Speakers are Wharfedale evolution 2 bookshelf speakers. Thanks...