[sdiy] soldering bananas

[Rude 66]

mornin',

working on my new synth, i came across this weird problem. i'm having a hell of a time soldering my banana inputs. it just seems the solder won't stick to it, sometimes i can pull the wire right off. i'vew used differenmt types of solder, with and without s-39, cleaned the things with 96% proof alcohol first to remive any grease, etc. 
i'm a little baffled, i've soldered jacks and all kinds of other stuff for 20 plus years and have never had this happen. any ideas from you people who work a lot with bananas? 

thanks!

r./


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