KT 170

Here's tube dimensions
https://tubemaze.info/tung-sol-kt170-to-be-introduced/

I'm looking forward to reading user impressions of this big tube.
Perhaps the KT150 turned up a notch in all areas?

"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.

"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/

"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.

johnss-
I imagine PL wouldn’t post this if that were the case
https://primalunablog.com/2020/10/30/tung-sol-kt170/

The KT170 will fit based on dimensions comparing KT 150
http://tungsol.com/tungsol/specs/kt150-tung-sol.pdf#:~:text=KT150,5.57%22%20%28141.5mm%29

https://vacuumtubevalues.com/wp-content/uploads/2021/04/KT170-datasheet.pdf

Pic of KT150 in PL
http://www.tonepublications.com/review/kt150s-for-primalunas-dialogue-hp-integratehttp://tungsol.com/tungsol/specs/kt150-tung-sol.pdf#:~:text=KT150,5.57%22%20%28141.5mm%29

4.5mm on each side(9mm difference) looks like it will be a tight fit, but I looked on my amp, and the front/rear tube spacing looks to be the concern. A call to PL to confirm is in order.

Good job, johnss.

Saved me from a future $800+ purchase.

"I've had them for about 400 hours now in a primaluna evo 300 power amp."

Interesting news stickmon. According to johnss, he contacted PL and told they wont fit.

This has my buy now finger twitching.

"They hit the xformers on any PL that uses 8 output tubes."

stickmon42-
Is that what Upscale told you? Tubes contacting  the Xformer case seems like a concern. I have the HP=8 

"It’s like having a new system. More lower mids, bass, live music feel. Was using KT-88’s."

wsrrsw-It's always fun to have that experience with a new addition.
I'm disappointed I can't try them in my amp PL HP. I will contact them directly to get confirmation on what stickmon42 indicated.

Interesting arrangement for the KT 170 to fit, Brad.

Must look quite dramatic with 2 amps in your setup. Bet it sounds great.