Dear All,
I got a mail, saying that Lampi's findings were being discussed here.
Long story short - We make a lot of different type of caps. For the sake of competition we divulge some details but not all.
The ones Lampi took apart were CAST630v, which uses a special mixed dielectricum, we are quite proud of.
In essence, the copper foils are separated by two layers of paper, which is vacuum impregnated with our WPIO liquid/oil. Just like a regular paper in oil.
The material inbetween is not Mylar, as speculated, but something Steen discovered would work great in this application. Which is why we use it.
The cap is not in an oil bath - as we found the fully casted foil sounded better, the paper however is permeated with oil.
Incidentally, the CAST100v is completely different, The CAST Mylar we did for the Tannoy project is different again, and it does contain mylar.
On order we also make a myriad of different setups, be it PIO, WP, Teflon, Tin, Polystyrene, metalized. etc. etc.
Best regards,
Frederik
Duelund Coherent Audio