solder-Eutechnic,Wonder,WBT??

Some further notes(aside from the superior conductivity of copper and silver) on the various metals used in alloy when making the numerous solders out there: Silver provides mechanical strength, but has worse ductility than lead. In absence of lead, it improves resistance to fatigue from thermal cycles.
Copper lowers the melting point, improves resistance to thermal cycle fatigue, and improves wetting properties of the molten solder. It also slows down the rate of dissolution of copper from the board and part leads in the liquid solder.
Bismuth significantly lowers the melting point and improves wettability. In presence of sufficient lead and tin, bismuth forms crystals of Sn16Pb32Bi52 with melting point of only 95 °C, which diffuses along the grain boundaries and may cause a joint failure at relatively low temperatures. A high-power part pre-tinned with an alloy of lead can therefore desolder under load when soldered with a bismuth-containing solder.
Indium lowers the melting point and improves ductility. In presence of lead it forms a ternary compound that undergoes phase change at 114 °C.
Zinc lowers the melting point and is low-cost. However it is highly susceptible to corrosion and oxidation in air, therefore zinc-containing alloys are unsuitable for some purposes, e.g. wave soldering, and zinc-containing solder pastes have shorter shelf life than zinc-free.
Antimony is added to increase strength without affecting wettability.

Thanks to Rodman99999,Albert_Porter,Dfhaleycko,Prcinka-for the WBT recommendation.I am still waiting for the caps,inductor,wiring and woofers to break-in,but as of this moment there is no brightness.Extremely easy to work with and a low melting point.
Tom

The stuff IS a pleasure, isn't it? Enjoy your music!

i have tried many of the current solders mentioned above. One summer after moving to Forida, bored with nothing but time I decided to listen to solder. My conclusions were. WBT, while very easy to work with, added a sheen or brightness to the music. If you listen to their RCA plugs they do the opposite so the solder complimments thier plugs well. When wanting to liven things up a bit I choose WBT. Copper based solder sold by Chimera labs is very good but must be sealed with clean teflon nail polish to prevent corrosion. Cardas is very good but adds a bit of metallic sound to the highs. Very, very slight mind you, but there. Wonder Ultraclear seemed to have the least sonic effect on the sound. ALthough at first listen the Ultraclear sounds muffled slightly. It opens up to give really no signature at all. My conclusion was that the Ultraclear is for someone that wants to hear nothing at all and the WBT is for someone who wants additional life in their system. These experiments took me 1 year to complete. Should probably find something more constructive to do with my time!

I doubt I'll ever hear such subtle nuances. But I will say this... I've been a long time Cardas user and recently switched to WBT. I couldn't be happier. It *flows* so much better.