What type of solder do you use and why?

Bear, i've heard rumour that Wonder Solder is a formulation that Tektronic's developed for use in their test equipment. How true this is, i don't know. Sean
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Riehl Copper solder from Starsound, has given me the best sound. NO LEAD..LEAD free highs. This formula is an original not just a re-label! I have 2 sets of cables both assembled by the same tech. One set with silver based solder the other with Riehl copper based solder. The Riehl based cables gave a much cleaner and more focused presentation along with more articulate mid and upper bass. The prescence of lead makes the others a no brainer!!!

Cardas makes a "quadelectric" solder for audiophile use.

I'm not sure if this will have any bearing, (HA!), seeing from the varieties of solder here, but of the 3, wonder, wbt, cardas, I find cardas to sound the best. how much, I don't know, but it sure seems that way to me. (I don't redo solder to see if there is a difference). I haven't noticed it being any harder to work with, in fact, they are all easy, these 3. I have noticed a noticable improvement washing the surfaces with xlo contact cleaner. I have not found any cold joints with this yet.

Cardas uses a quad-eutectic formulation which has lead, tin, copper, and silver. The point to this is that you would like the solder to contain at least a small amount of whatever metal you are soldering to, so that on a molecular level you get a very good bond. When used with copper wire, silver wire, silver-plated wire, and silver-rhodium plated connectors, I feel it is the best. If you want to save some money, though, plain old 63/37 is an excellent choice (avoid the more common 60/40; it is not eutectic).