According to [this interview (transcribed from the February 1998 issue of *Guitar Player* magazine)](http://www.oocities.org/sunsetstrip/backstage/1076/article2f.html), Kevin utilized a Heartbreaker combo for live work around the time of the release of Third Eye Blind's self-titled debut album.more
The Heartbreaker is defiantly one of the most underrated amps that Mesa/Boogie made. While it is very HEAVY, it has a lot of depth. The Heartbreaker is great for all those classic tones that are so sought after without having to own multiple amps. With sparkling cleans and a mean overdrive, this amp boasts true Mesa versatility. While it does not do great modern metal, it DOES do anything from early 80's hair metal to the classic tone that made classic rock what it is.This amp takes most pedals very well as well. Amp sounds very good quiet levels but can also get very loud. (even when running at 40Watts with El34's). If you can find this amp, take it while you can as not many were made. This amp did not sell well as most people associated mesa with modern metal and grunge. This is my go-to amp for almost everything.
I picked up one of these dirt cheap in a local pawn shop after I missed out on a much more expensive used Roadster at another local store. While it does not Djent, it produces some stellar classic tones with two gain modes on each of it's two channels, with a boost function on one of them. I thought it sounded great as-is, but after reading some opinions from other owners I decided to ditch the somewhat worn 6L6 tubes in favour of a quad of EL34s direct from Mesa (remember to change the bias!), and it absolutely screams now. Even on reduced output mode (40w with EL34, 60w with 6L6) it will vibrate your soul and wake the dead at half volume. The only real problem with this amp is it's HEAVY. It's not referred to the Backbreaker for nothing!