KT 170

"Interesting, but would any current amps be able to work properly with a KT170?"

Important point.
I haven't confirmed yet, but I'm thinking the upper level line of Prima Luna will accommodate these new bottles, as they do for the KT150.
https://primalunablog.com/2020/10/30/tung-sol-kt170/

I asked Ayon USA about the 170 and they said:

So yes we tested the KT 170’s and as with anything new they are quite unstable. Same thing happened with the 150s when they first came out and over time Tingsol fix them right up.
Our recommendation definitely stay with the 150s.

So, maybe eventually they'll relent.

"So yes we tested the KT 170’s and as with anything new they are quite unstable. Same thing happened with the 150s when they first came out and over time Tingsol fix them right up."

Like many new things introduced, first couple of batches reveals any weakness that might need addressing. I'm going to wait until early adopters report their experience.

I'm highly interested in the 170's for my PL Evo400. Please give us some feedback as soon as these are purchased. 

@tablejockey Upscale doesn't even have them listed for sale yet, which to me seems odd

"Upscale doesn't even have them listed for sale yet, which to me seems odd"

Maybe they haven't got the official "okay" from PL to say it's okay to use on "x" models, along with field history being a new tube?

Call them to get an answer.