used Integrated tube amp under $1500 for Klipsch Cornwall III's?

Don’t discount Decware amps. I am using a Torii II to drive my klipschorns and I find it to be a better amp for horns than my previous Line Magnetic 518. I also owned the Forte III and Cornwall IIs. Great speakers too.

Oz

A nicely restored Scott tube integrated. Still affordable (unlike vintage Marantz or McIntosh). I have two!

Mystere IA-11
I have the Mystere amp but not ready to part with it yet, it’s that good. Designed and made by sister company PrimaLuna. Tight rhythmic bass and extended highs that are not rolled off. And auto bias to make maintenance low.

https://www.upscaleaudio.com/products/mystere-ia11-integrated-amplifier

http://www.mystere-eu.com/usermanuals/mystere_manual_ia11.pdf

https://positive-feedback.com/Issue47/mystere.htm

http://www.mystere-eu.com/products.php?p=ia11

Coincident Technology Dynamo 34SE MKII.Would be a seamless match and well within your price range.Read the reviews.

OP said

yes my first used tube amp being of the older variety will look kind of wierd on the piano for the time being

I would much prefer seeing an old tube amp rather than a new one ANYWHERE. Any amp on a piano seems a bit rude to the piano, but, when younger I might have done it, do what you gotta do! Get listening!