Duelund cast Pio Hybrid Copper/Silver or Rs series with Silver Bypass PIO

Grannyring...the duelund silver foil .01uf bypass is Amazing.   I think it's one of the best bypass cap that works wonder in any cap.   They make a huge differences in Any cap! 

George.... thanks for the info.

let say if i did use the hybrid duelund 1.0uf 630v for the coupling signal, which is basically a silver foil .01uf cap bypass with the cast copper cap?  So this will not work?  What is the differences between de coupling or coupling?  Can you Please educate me on this? 

De-coupling, usually goes to ground for power supply smoothing.

Coupling caps have the ac music signal going through them, never bypass them, and always best to use one only here, the most highest quality you can afford.

Cheers George

The magic of the Cast caps is undoubtedly in the oil. I’ve used 600v Duelund Cast caps in an amp and I know the beautiful sound they convey until the oil leaks.

Oil leaks is one issue. What about the shelf life of the oil? Does oil degrade over time? Does the Duelund magic deteriorate over time?

V-Cap CuTF and Jupiter Copper caps won’t have those issues and are my preferred caps to use.

Excellent point!  I am with you on this, longevity might be the Biggest issues for the Duelund caps or any other caps that has the oil impregnated in them.   

No worries on the oil. I am not aware of any such issues in real life usage. Oil impregnated caps have been sold for decades.  This would be especially true for crossover usage where there are no heat issues to worry about.