Andy Gill

Carlsbro magazine advertisement from 1981 which features Gang of Four, specifically Andy Gill endorsing the Stingray: http://www.ebay.com/itm/retro-magazine-advert-1981-CARLSBRO-gang-of-four-/360382210692

Andy can be seen playing a Carlsboro Stingray with built-in chorus on The Old Grey Whistle Test. Possibly called the "Professional" model this Stingray had both built-in chorus and reverb. You can tell this because the effects section of the amp has four distinct knobs on the far right hand side.

In this article about the making of Gang of Four's "Content," it's explained that "Gill played through transistor amps, as he did on 1979’s Entertainment and 1981’s Solid Gold (in this case, either a Peavey Classic 50 Combo or Blackstar Artisan 30)."

In this Premier Guitar Rig Rundown feature, Gill states that he runs two of these 4x10" combos. One is angled toward stage right, while the other is aimed at stage left.

In this article on the making of Gang of Four's album "Content," it is explained that "Gill played through transistor amps, as he did on 1979’s Entertainment and 1981’s Solid Gold (in this case, either a Peavey Classic 50 Combo or Blackstar Artisan 30)."