I don`t believe Duelund is a "film" capacitor as mentioned above.To my understanding they`re pure metal foil and PIO(paper in oil) for the VSF and CAST versions. Not sure about their lower cost Alexander caps. The main obstacle to using Duelund is very high cost as Bhobba states above.I`ve yet to read of anyone disappointed with their performance after purchase.
Regards,
Regards,