looking for tube info

What do you mean by "effect"?

You didn't identify the amp in question but from an electrical standpoint the new KT88s should work without adversely affecting the amp.

They will probably sound a bit different but that may be as much due to old tubes versus new (tubes lose performance as they age) rather than the different versions involved.

The best you can really do is try different tubes and see if you prefer one brand over another. That's called "tube rolling." Different people may reach different conclusions.

I'm confused about your amps. You have mono amps with 4 KT88s in each amp and they are rated at 70 watts? Are they triode? What are these mystery amplifiers anyway?

Hi Robin

Someone who was very helpful to me was Brent Jesse @ www dot audiotubes dot com. He is very knowledgeable and was helpful to me when I needed a pair of tubes for a tube preamp I was messing around with. I'm a novice when it comes to tubes and he didn't blow off my questions. He may be able to help you.

I buy all of my NOS from Brent Jesse.

I've found Brent Jesse to be a reputable tube dealer. A man of his word.