Bill Wood and Jules Desmond are 1/3 Octave Band. One album’s credits say they play guitars, effects, field recordings and oscillators. They’re on the noisy end of the spectrum, but if your interest in ambient comes from post-rock or drone then here you go!
Here’s their album, Ultramarine, for classic New Zealand experimental label PseudoArcana.
There’s plenty more music available at their own Bandcamp page below, or sift Discogs to get a flavour for the many CDs, CDRs and lathe cuts released over the last couple of decades.