I just purchased the entry level Super Zen Triode, the one that sells for 995.00 I plan on using my vintage Altec Valencia speakers which have a
sensitivity of 97 to drive it. Has anyone else tried any of the vintage speakers like Altec or JBL and if so how did they sound?

That is what this amp the amp was born to do!  I cannot speak to that specific speaker, but this amp is a favorite for things like horn-loaded speakers (a lot of Klipsch stuff), full-range drivers (often very high sensitivity, look at the sort of products in the speaker Store on Decware, those are all a perfect match), or any speakers designed to be sensitive (Zu Audio, Tekton, etc.).

I'm a week into my UFO2, and playing them on an 'inappropriate' 89 dB sensitivity floor standing speaker is just a blast!!!  Plenty loud for hours of listening, and the speakers have never sounded better or more alive.

This amp punches FAR above its class, with the only catch being it does not have a ton of power, which is not an issue for most people and with sensitive speakers (like yours)...is not a problem at all.