I believe I remember that Paul said, or it was written somewhere, that PS Audio auditioned different kinds of solder used in the DS. What kind or ratios of solder did you settle on?
We have had to choose between the best sounding solder and what’s legal. Lead is no longer legal to use in solder (thank goodness) and silver content is restricted by process limitations since most all our products except BHK are surface mount based (meaning the solder’s a part of the chip being placed).
On the BHK we use high silver content lead-free solder.