professional player string tension (80's-90's)

[bdmntnplayer]

I was wondering what the string tension of the old professionals used to be, like Han Jian, Zhao Jianhua, Yang Yang, etc. I know that they used the old Yonex rackets, such as Boron 2 and Cab 20. So I was wondering what the string tension of the old time used to be, since I'm curious as to see the difference between the materials of the past and the current (this includes the strings and the durability of the rackets). Please help.

[green.blood]

Anyone knows max tension for the old CAB 9? A lot of doubles during the 80's ~ 90's use it. Most shops here won't dare to go 28lbs as per my request but I doubt the the pros strung it below 28lbs even in the 80's.

[double]

I's told that
Ricky strung cab-9 with BG65 at 30lbs
Zhao strung boron 2 with BG66 at 27lbs