Just to add a bit more info. I built the original GAS Ampzilla from kit in 1975, after meeting Jim Bongiorno, Jon Dahlquist, and Saul Marantz at the Dahlquist room (driven by an Ampzilla) at an Audio show in DC. I also owned a GAS Ampzilla II…
Fast forward to 2013 or 2014, I was looking to rebuild my original Ampzilla. I cold called Jim’s company on a Sunday afternoon to leave a call-back message about rebuilding the amp, and Jim answered himself. We talked for 2 hours about amplifier design, with him telling me about his strategy for the new Son of Ampzilla II he was designing for his new joint company Spread Spectrum Technologies (SST). Mr. Bongiorno died perhaps 3 months after our conversation, but I never forgot his kindness. A year ago I had the opportunity to buy a used SST Son of Ampzilla II from the Music Room, just after Underwood Wally no longer sold them (Wally is another super-nice guy who spent a lot of time with me).
I am hugely impressed with the sound of this amplifier. SST is made by Wyrd for Sound as I understand it, and thus provide repair. I am familiar with the house sound of Mac, and some of this sound is due to the use of autoformers in the output. But the Son of Ampzilla II is truly a giant killer, and I would think that the monoblock Ampzilla 2000 II’s to be even better!
