did the sunset sound studio in actuality use the bill putnam 610? on their website it says it was a langevin (am-4 i assume.) i know there are a couple of other historic tube consoles that were used around this time, i think altec is one, obviously ampex. helios? MCI? what are the model names for these big dogs? can you share any references of some big 60's artists and which tube console they used?