Dirk,
?agree, the Sn95,5Ag3,8Cu0,7 ( I use a Kester product) works well. However you do have to use higher heat. I have used the lead free for a lot of projects, but for the QMX I went back to 60/40 Pb based due to the heat issues with a 6 layer board.?
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73, Dan? NM3A