SST Ampzilla 2000 v2 vs Son of Ampzilla II

These are both excellent amps! The last masterworks of James Bongiorno! I own several of his designs from SAE, GAS and Sumo. The Ampzilla 2000 from Spread Spectrum Technology will be an excellent match for your SC-IVa’s! Plenty of power - no need for the Son monos. I’d put the Ampzilla 2000 up against any of today’s expensive ($10K  -$20K +) amps!

@kw6 : That I can't say! Either of these new versions made by SST are sonically competitive with today's expensive amps (no need to mention names here!). 

The original Ampzilla (1976) was considered the BEST sounding SS amp at the time! That is when I first encountered it! Harry Pearson (TAS) even thought so! He called it "surgically romantic"! James Bongiorno claimed that the improvements to the original design made a " better" sounding amp - the 2000. I never owned the Ampzilla. Only the original Sons. Now have two in my collection. Presently using a Son with my DCM Time Windows. Great sound - no urge to change (plenty of other amps in my collection). I’d bet the new versions sound great, too! The Ampzilla 2000 has plenty of power - no need for a pair of mono Sons!

Get the SST Ampzilla 2000. Use the money saved to upgrade your signal source. I own (and prefer the SP6) over the older SP3. New mc cartridge, DAC ... BTW, your SC-IVs with the beige grills look really nice! Don't go back to the black!

GAS offered a transformer for bridging the original Ampzilla and the Son. 600wpc and 240wpc, respectively. Into 8 ohms, of course! 

@counterreset : No, Ampzilla 2000 and the Son Mono's are different circuits - like the originals!