Most tea has exactly the same effect on the Tinnitus as coffee because most tea either:

(1) Contains caffeine, or

(2) Contains substances that are converted to caffeine in the body.


"While coffee and tea are both sources of caffeine, the amounts of caffeine in any single serving of these beverages varies significantly. An average serving of coffee contains the most caffeine, yet the same serving size of tea provides only 1/2 to 1/3 as much.(Ref.: Caffeine by The Institute of Food Technologists' Expert Panel on Food Safety & Nutrition.) One of the more confusing aspects of caffeine content is the fact that coffee contains less caffeine than tea when measured in its dry form. The caffeine content of a prepared cup of coffee is significantly higher than the caffeine content of a prepared cup of tea."

from:
http://www.stashtea.com/caffeine.htm