My pencil solder iron for circuit board is slow to melt solder then solder just sets on the pc board next the the wire doing nothing. If I hold it there 30 seconds it begins to try and stick. I think maybe a variac can be used to turn 120v up to 125v or 130v or so to get a little more heat.? I cleaned pencil solder iron tip its not hot enough for solder to stick to the clean copper tip? I used my solder gun to make solder stick to pencil solder iron tip still pencil solder iron will not solder PC board.