Rivers Cuomo

"While on Weezer's Northern California tour in August '92, Rivers bought a curious Mesa/Boogie amplifier (pictured inside the Blue album cover on the left side) at the Berkeley Guitar Center. I have never ever seen an amp exactly like this one since. It was a very early issue Mesa/Boogie, from approximately 1977 or 1978, and its face plate said "Mesa Engineering", which predates the addition of "Boogie" to Mesa/Boogie's name. It was a 60-watt head which apparently didn't even have a model number (I remember looking for one several times).

It sounded incredible, and its real bonus was still sounding rich and thick even at low volume, making it ideal for recording demos late at night in the Garage. Sadly, while on tour in '96 (by this time as a backup amp), the Boogie suffered a near fatal blow from an unknown source during shipping. At some point during the tour, the amp was fired up to check it, and it sounded terrible. It was supposed to have been taken in for repairs, but apparently was lost somewhere, either at Weezer's storage facility in Los Angeles or later, when Rivers was living in Boston. No one seems to remember where they saw it last, and it is gone. Several fans have written in with info on this amp, but most identify it from the reissues. I have checked the reissues but none are exactly the same. However, several people wrote in with the explanation that this was the 60-watt version of the Mark I head. The reason that the amp had no name on it is that it was not named until Mesa/Boogie issued their next amp, the Mark II. A reissue version of the Mark I is available right now from Mesa/Boogie in a 100 watt head or combo form with a switch to reduce the power to 60 watts, and it is that edition that some people were confusing the "vintage" amp with. Patrick Wilson today owns a Mark I reissue in fact, and can confirm that the old one had some pull out knobs that produced amazing sounds that the current reissues do not produce. It's entirely possible that the pull-out knobs were a custom job..." - Karl Koch, weezer.com

Mentioned in this article under the "After Blue" section.

Rivers plays a Diesel head that has been modified to say "Weezer" on the front.

Rivers on the Kemper Profiler: “I just profiled the setup I was using before. It was the Diezel VH4 - I did all my main crunchy rhythm sounds, plus my crazy sustain lead. I got everything I need and then over time I started adding things into my lead channel, like an octave lower or a crazy chorus or a little flange. I built all these different sounds, it was really a lot of fun. And all I use beyond that is my Boss tuner!”

Rivers used an AC30 to record the rhythm clean tracks on "Island In The Sun."

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.

Can be found under the "Spr/Sum Touring" section of this article.

At the second paragraph in the "1993-signed" section of this article, it explains River's 8x10 cabinet.

"The one thing Rivers did manage to select before they left for New York was a new Marshall speaker cabinet. Well, it wasn't "new", it was a very unusual 1968 Marshall. This cabinet was from a now-rare series that mounted the usual 4 12" speakers into a special cabinet that was designed to fit 8 10" speakers. These are known as "mock 8x10's". They originally were sold in sets with plexi 50w Tremolo amps. They were manufactured from 1967 till the early 70's, but apparently the later years are distinguished by cheaper materials, particularly particle board backing panels. ...Thanks to Jaques Stompboxes for info and assistance!"

It is also shown in the cover of River's album "Alone".

https://i.ebayimg.com/thumbs/images/g/p0AAAOSwGYVW~tv5/s-l225.jpg

On Weezerpedia it says,'' For an amplifier, Rivers used a Randall 120-Watt solid state head powering a matching 4x12 Randall cabinet. The speaker cabinet (pictured on the left side of the Blue Album garage picture) continues to be sold and resold. And has been spotted as recently as late 2000 in LA's "Recycler" Magazine.''

In a photo from Bizarre Fest 1996, a Marshall JMP MKII Super Lead 100W is clearly visible directly behind Rivers Cuomo.