Hi, (BTW, we use our real names on this forum. Please read the Forum Rules)
Welcome to the forum.
You should begin by downloading the service manual. There may be differences in the cards so you should be sure you're getting the right one.
You can find the link in the "Links" sticky above the General Forum under the post titled "Studer links".
http://www.tapeproject.com/smf/index.php/topic,396.0.htmlOnce you've figured out the right card for your machine,..
For a bargain you can scan the eBay listings for Studer/Revox parts. There are a number of guys who sell cards both here and abroad. This does take a bit of time and patience but contacting the sellers and shopping for price should pay off. Just be sure there's a good return policy.
Another strategy would be to join the Studer Yahoo tech group and ask there.
http://tech.groups.yahoo.com/group/STUDER/If you're in a hurry and don't mind the price of a new card, you should try JM.
http://www.jmtecharts.com/