Philips Cassette Overload — Open-D Acoustic Grind
Richards recorded the core sound with a Gibson Hummingbird in open D and a second high-strung acoustic, forcing both guitars into the microphone of a Philips cassette recorder until it distorted. The cassette was then played through an extension speaker, creating a compressed, electric-like grind before additional electric rhythm and lead parts were added. The recorder had no conventional calibrated controls, so its settings are representative. Source: Guitar Player's Keith Richards cassette-recorder feature.
OtherOpen D