Eric Clapton

Eric Clapton uses Ernie Ball Regular Slinky Guitar Strings (10-46) on his non-archtop guitars, as noted by Ernie Ball.

From a 1968 interview with The Rolling Stone Magazine:

[R.S.]: What does “Disraeli Gears” mean?

[E.C.]: It’s a pun; it doesn’t mean anything. In England there is a big thing on racing cycling and on the back wheel, fixed to the hub you have a gear with ten gears, called a “derailer.” That’s the pun. We were just in a car one night kicking up puns, like Duke Elephant and Elephant Gerald, and “Disraeli Gears” just came up and I said that would be a good name for the record.

[R.S.]: Who’s your producer?

[E.C.]: [Former Mountain bassist] Felix Pappalardi. He’s been working mostly on the folk scene, people like Joan Baez and that. He was just around Atlantic City and said he wanted to do it and we wanted him.

[R.S.]: What kind of guitar and amplifiers do you use?

[E.C.]: A Les Paul, a modern one. A solid one. Same pickups, more or less the same neck, just a different body than the 1958 ones. It’s obviously not as good a sound as the old ones, ’cause they’ve got vintage, like old wine. I haven’t got any old ones still intact, they’ve all gotten broken, warped. When a guitar is that old you’ve got to be careful. There’s a maker, I think it’s Hagstrom or someone like that, that’s copying the old Les Pauls, but I wouldn’t buy one.

[R.S.]: Amps, and how do you set them?

[E.C.]: Two 100-watt Marshalls. I set them full on everything, full treble, full base and full presence, same with the controls on the guitar. If you’ve got the amp and guitar full, there is so much volume that you can get it 100 miles away and it’s going to feed back – the sustaining effect – and anywhere in the vicinity it’s going to feed back.

[R.S.]: Strings?

[E.C.]: Fender rock and roll.

Eric Clapton uses Ernie Ball Regular Slinky Acoustic Guitar Strings (12-54) on his acoustic guitars, as noted on the Ernie Ball website.

"C.F. Martin and Company is proud to introduce the first sets in a new line of Artist Choice acoustic guitar strings, Clapton's Choice Phosphor Bronze. The Clapton's Choice Phosphor Bronze guitar strings have a distinctively clear, warm tone with a hint of brightness that can highlight the subtleties of any player's style. Live or in the studio, these strings deliver the kind of performance expected by Eric Clapton."

"C.F. Martin and Company is proud to introduce the first sets in a new line of Artist Choice acoustic guitar strings, Clapton's Choice Phosphor Bronze. The Clapton's Choice Phosphor Bronze guitar strings have a distinctively clear, warm tone with a hint of brightness that can highlight the subtleties of any player's style. Live or in the studio, these strings deliver the kind of performance expected by Eric Clapton."

At 3:58, Eric mentions using an Ernie Ball Electric Guitar Strings Regular Nickel Slinky 10-46 during a live performance.