Sandy Bull emerged from the acoustic folk and fingerpicking revival of the 1960s, and while his first release, a collaboration with Billy Higgins entitled Fantasias for Guitar and Banjo, hinted at his later experimentation, 1969’s E Pluribus Unum showcases his innovative blend of fingerpicking techniques and electric experimentation. He was a master of many string instruments including the banjo, pedal steel, and the oud, which he’s holding shown in the album cover for E Pluribus Unum.
Another remarkable thing to keep in mind listening to No Deposit-No Return Blues is that Bull is playing every instrument on the record, including percussion. Not only did he make use of overdubbing in the studio, but he also performed with pre-recorded tracks when playing live, as demonstrated by the live record Still Valentines Day, 1969 put out by Water in 2006. While the oud is featured on No Deposit-No Return Blues, to get a better idea of what it sounds like I’d suggest giving a listen to this improvisation from that live record.
Vanguard has released a number of compilations of Bull’s work from the 1960s, including improvised material, classical pieces by Bach, and more blues-oriented stuff like this track. One of my favorite labels, Drag City, put out a live album by Bull which also credits the Ace Tone Rhythm Machine, thought to be the first commercially-sold drum machine. To hear Bull perform live with his oud and this early drum machine check out this track from the Drag City album. In 2010 his daughter KC released a documentary about her father also called No Deposit No Return Blues that I couldn’t find a full version of online but which I would definitely want to see.