Ctaudio15, I would think for $5-800 you could easily find a Dyna ST 70 and upgrade it (cleaning connectors, controls, and switch, and replacing caps and weak tubes), or one already upgraded. If you check with 213Cobra he will agree with the musicality of an EL-34 amp.
Unfortunately I have very limited experience with Zu speakers but I built an original ST 70 and have owned a few more in the decades since then. They may not be the last word in detail or woofer control but they are unfailingly musical (when operating correctly) and remain affordable.
Unfortunately I have very limited experience with Zu speakers but I built an original ST 70 and have owned a few more in the decades since then. They may not be the last word in detail or woofer control but they are unfailingly musical (when operating correctly) and remain affordable.