thank you for the replies,
I come back from phils radiators this morning and he said that adrad are the only guy's that still make a dimmple tube core(this core is made here in Australia I have checked) and he can build me one.
we have come to the conclusion that the copper is contaminated when they are sitting in the factory waiting assembly.Copper is dark in colour and when assembled the solder does not take to the copper and that allows moisture and other contaminents in and they call it dry rot.
using the tanks and gatting Phil to assemble it I know there are only good clean copper and 60/40 solder, he is one of the last to use this stronger solder as most us 70/30 solder.
Thanks
Ben
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