A hardware secondhand Roland RE-201 Space Echo is very expensive nowadays. These IRs don't offer the same flexibility as a real Space Echo but the sound is as warm and as analog as it gets. Please note that the noise was removed so if you need more realism you have to add a bit of noise. You can even try using only the left or right part of these stereo IRs, or set the wet signal to mono.
OBERHEIM OB-XA + MINIMOOG VOYAGER
3 hours ago