3 tone control integrated amp/preamp

Accuphase. If you can get a us voltage one at a decent price. Spectacular. 

Check out Ehard Audio.  35 watts of tube sound under $3k

My backup integrated is a 15 yrs old Vincent tube/SS hybrid that has tone controls and.....a loudness button!  150 watts RMS.  I have thought about selling it but I am having a hard time uploading photos.

An old Marantz won’t depreciate and may actually increase in value over time.

I think a “midrange” tone control is too undefined a parameter.  I use a C-J line stage that has EPL loops…same as tape monitors…and a Schiit Lokius to help add or subtract color from recordings.  Not as good as parametric but way simpler to use.  Maybe you could score a used McIntosh C48, C49, or an MA-7900 or MA8900?  These have 5 rotary EQ controls.