The same tube will sound slightly differently in different amplifiers due to the circuit and other associated components, so no hard and fast rule. Thats the joy of tube rolling.
Generally I find my sound hierarchy as (highest) vintage British > vintage European/American > Communist Block > Chinese (lowest). This also equates to the build quality and materials used.
However; some vendors who are having tubes produced in China now but control the design, materials and QA are producing some excellent examples, but generally the run of the mill stuff is quite poor.
Edited by complin - 6/1/14 at 3:02am