Which Tube Tester

Many if not all B&K are solid state which is actually a good idea and produced well into 60s giving you the options you want. I don't know if the prices quoted are for excellent working condition calibrated examples. You have to realize that there only a few guys left with any real experience working on these. Be very carefu there is a lot of pure useless S**t, sold on ebay. I found out the hard way. Spend the money!or borrow someone elses. You should IMHO buy it from a reputable dealer it's worth not throwing good money after bad. BTW I use a 800 Hickock which test only some of your tubes but is a very good instrument.

Can any one suggest a tester for KT88s

I came across these two testers

http://www.vacuumtube.com/toppage31.htm

www.maximatcher.com

I think bother tester are new products whereas most only tester Ebay is over 30 years old.

I have no experience with them but the Maxi-Matcher look good.

What about the AT1000? Isn’t this a prima tester for audio use?
http://www.amplitrex.com/at1000.html

A B+K 650 will do the job for you on all your tubes.
I am also pretty sure the earlier 500 + 550 will do all as well. I havn't used my 500 for a while and it is at home and I'm not.
They eariler ones are Tube regulated not Soild state.

You also want to get one that tells you the Transconductance (gm) value of the tube, such as the ones I mentioned.

Try to stay away from just emmission testers.

Here is a very good link for B+K testers: http://tone-lizard.com/B%26K.html

Another one to get you up to speed on Tube Testers:http://tone-lizard.com/Tube_Testers.html