kt88 or 6550 test data for Hickok 539c or tv7d/u

I just wonder if anybody know the test data of kt88 or 6550 tube for Hickok 539c or tv7d/u tube tester?
Any good website for looking test data info?

6.3 HS-5348-1 1.4 P4 C Min. 6250
specs for TV7:

fil: 6.3
selectors: HS5-3481
bias: 12
shunt: 0
range: D
min value: 44
Samhar and T2232,

Thanks for the info. I just wonder what is the difference between 6550 and kt88?