Used for the guitar on Icky Thump, as stated by recording and mixing engineer Joe Chiccarelli in this October 2007 Sound on Sound interview.

“The Trident at Blackbird Studio D was used for monitoring, and also some guitar microphones, plus most of the room microphones. Some room mics went through an API 512, and a few through a crazy old RCA OP6 tube preamp. Most of the other close mics went through various Neve 1073, Brent Averill API 312 and Chandler TG2 preamps. Jack loves the sound of ribbon microphones, so we used a lot of them, on guitar amps, vocals, and as room mics: Coles 4038, Royer 121, AEA R84. I would have six to 10 room mics up, and would chose a stereo pair from them.

(...) “For the song ‘Icky Thump’ I had the Royer and an AEA on Jack’s two guitar amps, and a couple of U67s for room ambience. In a few cases I used the Shure SM7 guide vocal mic. Ribbons are prone to overloading, so we blew out four Coles mics on the guitar amps. Luckily Jack had several Coles 4038’s with him! The guitar mics went through Neve and Chandler preamps, and then always through an API 550A EQ, and then an 1176. The Univox sounded great acoustically in the room and was miked with a U87 across the room, going into a Chandler TG2 preamp and then some slight compression with an LA2A.

“Jack is very particular about his vocal sound, and it’s one of the things on the album that we really took a lot of time for. He is very sensitive to what he hears in the headphones, and he wanted something that gave him juice and was exciting to sing to. So every song had a different mic/preamp/compressor setup. Most of his vocals were recorded through an old RCA 77DX mic, but for some of them I used the Shure SM7 guide vocal mic. On the title song Jack’s vocals were recorded with a Telefunken U47, going into a Neve 1073 preamp and then into an 1176 compressor.”

This is restated by Chiccarelli in this October 1, 2007 Mix Online interview.

The Twin was one of two amps that Jack White used, the other being a rare Silvertone piggyback amp. Chiccarelli used an assortment of ribbon mics on the amps, including an AEA R84, a Royer 121 and a Coles. He would also put a Neumann 67 back in the room for ambient tracks. As far as outboard gear, Neve 1073 preamps and UREI 1176 compressor/limiters were typically used, with a Fairchild compressor also being employed occasionally.

Chiccarelli was careful with the track's loudness. “I don't record extra-hot levels to tape,” he explains. “I like to have headroom and the openness, so stuff was not overly distorted to tape. I prefer having the transience left intact, and if I need to overdrive something, I'll do it with an outboard box.”

Sold for charity on Moby's official Reverb shop.

The AEA R84 can be seen in use during the recording sessions for "Holy Fire"

I like Shure SM57s and 58s. There’s always a vintage Neumann U67 set up that I can record anything with. I have this cool new mic that’s made by Chandler Limited called the EMI REDD. I love the sound of it, and it seems to never need any EQ. That thing always stays up on a stand, ready to go as well. I’m also very partial to my pair of old Sony C-37As, as well as my Beyerdynamic M 88. I arguably use an M 88 more than I use 57s and 58s. I dig AEA ribbon mics too, like the R-84As.

Andy mentions using this microphone to record guitars in his Norm album. “I recorded the J-50 with an AEA R84 ribbon mic, but mine is sort of broken so it has this weird resonance happening."

In the video "EPIC HOME STUDIO SETUP 2022 | Jeremy Lutito (studio tour)" by Andrew Masters on YouTube, at timestamp 5:08, an AEA R84 ribbon microphone is clearly visible positioned over Jeremy Lutito's drum kit, confirming his use of this specific gear.

In the attached article and video from AEA's website, it is mentioned and shown that Mario is singing into an R84.

In an Instagram post, Pauli Halme mentions using an AEA R84 ribbon microphone, stating, "I’m miking it with an AEA r84 ribbon mic, I like the way it makes the tiny little practice amp sound like a real thing!"

Featured in this Instagram post by Coons.