Tube amps under $7500

I would recommend an older Conrad Johnson such as a premier 140 used, Also, Manley Snappers, I’ve had great luck using both. They both will fall within your budget. Both of these amplify sound glorious. Good luck with your search. 
 

Michael. 

For $7,500 you can get a PrimaLuna EVO 400 integrated and swap the EL34s for KT150s. I did, and hear added body and slam, and a wider soundstage.

If you go with a pair of Atma-Sphere M-60's (a great amp, which I have owned) or S-30, for use with a 4 ohm loudspeaker you will need the Z-Music Transformer, which raises the impedance the amp sees. OTL amps don't like low impedences.

Ayon Spirit. You can use it as a power or preamp or integrated 

@bdp24 Appreciate the warning. At this stage I should focus on amps with dedicated 4 ohm tap.

@passthedutchie Like you I would naturally incline to KT150s and wonder why the unit costs $400 less with these vs. stock EL34.