Sequential seems to use the vintage=less stable oscillator description, as part of their overall definition of vintage, in their marketing. Dave Smith designed the original in the 70s, so he ought to know:
Sequential.
To make the Matriarch sound more vintage, by the above definition, just avoid exercising the calibration procedure, and over a period of time the oscillators should get less stable. Or be sure to record it before it’s fully warmed up (15 min.).
I’ve never owned a Sub 37 but if it also takes time to stabilize the oscillators, just record it while its still cold.
Or get a Sequential synth with Vintage knob.
Or to remove all doubt, get an old synth