Im digging into a lost world and am going to replace the rectifier board as it pretty much looks toasted. I know that alot of these old components have lead in them and want to be sure how careful i need to be cleaning this up. I pulled the board off its mooring and found alot of this white paste. I know that lead oxide is white but is usually is more solid or powdery. Any of you old pro's know if this is isulating compound, lead or a mix of both?
It is a thermal compound. Totally safe, comes in tubes like small tooth-paste. It is used to make a good thermal bond for the bridge rectifier to transfer heat to a heat sink. Looks like the last person put it on the wrong side (or both sides) of the br. This would put heat to the board and make things worse.
The BR would be soldered to the board and either a heat sink mounted on top or in this case the BR get mounted to the solder (not component) side of the board. Then the thermal compound gets put on the BR and the board is mounted to a metal plate that acts as a huge heat sink.
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Salt Lake City, UT