Best Solder??

I have used Kester 24-7068-7063 for repairs and Diy. Rosin Activated 96.5% Tin 3% Silver 0.5% Copper

Jeff at Sonic Craft (who knows a lot about this stuff) advised me to use Cardas Eutectic solder. He gave me reasons why it was better than the Mundorf and others, but I can't remember what they were. I think it had something to do with the amount of silver content and also long term corrosion. Call him.

I had My Rogue 99 Super Magnum -Se preamp built completely with the Mundorf Supreme solder which I found out is 9% pure silver 1%gold and 3%Copper and then the standard tin mix.It is the best solder on the market and complement my Mundorf silver gold oil capacitors,even the Hifi tuning Supreme fuses which are superb and the new rave were designed with this exact Supreme Solder.

For me it's WBT.I have a lifetime of experience with soldering in High-End Audio. The Quality of sound shows up big-time on interconnect terminations RCA and XLR. UnGodly exspensive and
worth every penny.I have not yet tried Mundorf Supreme.
I found out the hard way one time when I ran out of WBT and used Kester Silver solder. Not the same, in any Audio application.

WBT 4% siver. Perfect.