The New Duelund Tinned Copper,paper in oil .1uf bypass caps are Excellent
The New Tinned Copper which their new Jam caps have which I have in my preamp are truly excellent they have a aluminum case ,not quite as good as the top paper case. The Tinned Copper bypass cap I just got .my brother and his friend say these little caps truly add depth,as well as air to loudspeakers.
They also have a Silver paper in oil , a little better detail ,then the Copper bypass
But not as much body. And at 600volt can be used anywhere.