solder-Eutechnic,Wonder,WBT??

I really like the Cardas quad eutectic. I bought 20ft. of it and 20 ft. of the new Wonder solder ultraclear recently and did an experiment with each separately on the connections of my preamp output caps as well as the wires to the volume pot. I initially cleaned off all the original solder( not sure what it was) and applied the Wonder solder. I listened periodically for a couple of days. Then I removed all the Wonder Solder, recleaned the connections, and applied the Cardas Quad Eutectic. Although both solders are wonderful to use( they both melt quickly at relatively low heat) and they both flow nicely and give a nice solid joint) I preferred the overall sound of the Cardas Eutectic. It just had a more natural sound with better harmonics and a cleaner, more extended top end. One guy on the Tweak Asylum at AA, as an experiment, actually used a couple feet length of each of the solders you mentioned as interconnects. He preferred the sound of the Cardas as well and used the Cardas as his main source of solder from then on. Just some food for thought. As usual, YMMV.

And many people prefer the "warm", colored, euphonic, "tubey" presentation of Mullard and Brimar tubes over the transparent, uncolored presentation of Telefunken, and Siemens tubes(etc). Yadda, yadda, yadda! Tastes vary, but the laws of conductivity and electron flow don't. Some metals are better with regard to electron flow and some aren't. You can use equipment, cables, tubes, caps, chassis wire, interconnects, and solder as tone controls(to satisfy your particular tastes), or try to find the ones that provide the most transparent(faithful to what's recorded) presentation. Personally, I prefer the latter option. What's "right" to you may(and almost certainly will) vary.

I also prefer the latter, of finding the ones that provide the most transparent(faithful to what's recorded) presentation.

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