Hello,
The answer is yes. But silver alloy isn't the idea. (It is an issue if the soldering is exposed to outdoors or something.)
Most importantly, "how" you solder make a difference. If you look at your soldering, you should see very shiny looking soldering and a not-so-shiny soldering. Or some might be striated. You must make your soldering completely shiny without any sort of blemish. The no-so-shiny soldering has different conductivity from shiny ones. And sometimes offer very little conductivity; effectively screwing up your amp.
The reason why I say silver alloy isn't the idea is that the above can happen with any solders.
The best solder is as you know like wonder solder and some such. They do use silver, but most importantly melting point is very low. This is good because cooling of solder is shorter, therefore decreasing the chance of getting blemishes in the soldering. In other words, good solder is designed so that you can make "shiny" soldering EASILY. (Conductivity issue is rather secondary compared to that.)
You can make "shiny" soldering with any solders with some know-how. I can't exactly tell you how other than keep the tip immacurate. You just have to get a hang of it.
I use standard ones. Lately I am using silver ones cause, I happened to have a roll. I was testing the idea, but my standard roll ran out and I haven't bought new roll yet. So I ended up only having silver ones. In other words, you don't have to "hustle" to get silver ones. There wasn't much difference if you ask me.
Tomo
P.S. Lookie this:
http://www.kester.com/alloy_temp_chart.html