Weezer – Weezer 30 (Anniversary Super Deluxe)

Under the section "Green Album" you can see that he used a Mesa Boogie Dual Rectifier and a 100 watt Marshall head to record his rhythm guitar tracks.

Rivers used this guitar (Black version) during the Green Album era and was even on the album cover. Also covered in stickers given to him by fans.

Rivers Cuomo might have used a white Fender Telecaster with a rosewood neck and a neck humbucker, during the recording of the Blue Album. This guitar was given to Jason Cropper after Rivers was given Jason's modded Strat. This is confirmed by a user-uploaded photo.

In this user-uploaded photo, Rivers Cuomo is seen with a 1960 Gibson Les Paul Junior Doublecut in Cherry Red, which belonged to Blue Album producer Ric Ocasek. This guitar was used to record the rhythm parts for the album's tracks.

Rivers Cuomo utilized a Gibson Les Paul Junior while recording the Blue Album in New York, as seen in a user-uploaded photo on Blogger.

This one can be heard on intro to "Jonas" and "In the garage", according to Weezerpedia. Used around "Blue" era.

Used on The Blue Album and Pinkerton, according to the following sources. The version is not specified in either.

Guitar World, March 1997, "Schoolhouse Rock" (as transcribed on Weezerpedia)

GW: Pinkerton, however, is gimmick-free.

Rivers: Yeah, we trimmed that part of ourselves—it was the natural thing to do. So I think we're also going to trim some of our audience, which is unfortunate. We were never one of the top bands like Green Day or Offspring anyway; we were always a notch below. Maybe now even two notches below. Yeah it's a bummer, but I don't really feel like I have a choice in the matter. I've got to do what I've got to do, and right now that means not making the gimmicky video and not using language that's quirky. It means speaking more directly. Maybe the audience will be smaller, but at least they'll be liking us for the right reasons.

GW: What guitars and amps did you use in making the record?

Rivers: I think I used Gibson Les Pauls. I don't remember whose they were, where they came from, what kind of specifications they had—but I know they were Gibsons. For amps I used Marshalls. I also used a Big Muff quite a bit. It was about as standard a setup as you could have.

Chris Shaw, Gearslutz, "Weezer Say It Aint So Chorus Vocal Sound", Comment #34

Ummm, Some corrections re: the Blue Album:

• Vocals were done with a U67 at Electric Lady and a U87 at Rics house (surf wax, and some bgvs)
• There were NO REVERBS OR DELAYS at all on the record (The sole exception being a long delay used to extend one of the feedback parts on Only in Dreams). Ocasionally I used a stereo delay from the Lexicon 300 to delay the room mics slightly to get a little more slap. The band used to come into the control room at the start of the day and turn off all of the delay / reverb based outboard gear.
• When we did the recall for the Say it In't So single the assistant on the session called me while he was recalling the mix because he thought we were missing a few pages of notes. The only piece outboard was an 1176 on the ld vocal. That's all I used. Everything else was just the SSL E.
• All BGVs were doubled or tripled - no obvious artificial chorus was used at all. The only effect I might have used would be an Eventide 910 set to 15ms on the left and 7.5 ms on the right. (harmonize ratio set to 1.00 (that thing always drifted slightly anyway). This was only used to widen the lead vocal in a very, very, very subtle way.
• The album was tracked on Electric Lady's Focurite Forte console in Studio A with the remote pres (the pres were in the live room and ran at line level to the console)(I posted some pics around here of it.). Some overdubs were done on the SSL G in studio C (I distinctly remember cutting the gtrs for in the Garage up there. I believe we used a Tele through a Big Muff using E. Lady's Fender Twin for that tone. We also cut the clean rhythm for Say it Ain't So up there on Ric's Jaguar using E. Lady's Fender Twin
• The bass break for In the Garage was my Electro Harmonix Graphic Fuzz (original, circa 1980) across the insert on the SSL.

As stated on Weezerpedia, https://www.weezerpedia.com/wiki/Rivers_Cuomo%27s_equipment Jason Cropper received a telecaster from Rivers Cuomo. Has a HS setup with a Humbucker in the neck. May have been used to record Jason’s original guitar parts on the Blue album. Jason can also be seen using the guitar live in 1993 https://www.youtube.com/watch?v=-g0xpSkApHo https://www.youtube.com/watch?v=aAt0l5nxoxo

Brian used the Mesa Boogie Mark 1 amp he borrowed from Rivers through out summer of 1994, though he changed the amp 2 times before he got his JMP Plexi but this amp was used for the most of time. It also had few stickers, some gold sticker + custom Weezer sticker. He might also used it at Undone B-Side sessions in June of 1994.