There are a million ways to do this, of course — including specialized tape-delay plugins, and pedal effects like the Strymon El Capistan. This article helpfully breaks down dub delays into their component parts, so to speak — and offers some insight on how you could tweak prepackaged effects to be more, well, effective.

Creating Dub Delays With Standard Plugins – Attack Magazine

In this tutorial, we’ll walk you through how to create dub-style dirty tape delays using standard plugins.