I'm a fan of the works of Dan Burns and Jeremi Clive - names you may not know but should spend some time looking into. Together, they've created a project called The Brain - an ambient album that, personally, I don't think really nestles into the background enough to qualify as purely ambient! The title track is an absolute banger worthy of heavy rotation and the rest of the record often has an ominous tone to it.

Lots of vintage synth sounds and effects throughout - all of which is very much up my alley. I believe it may be up your alley as well.