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Are there any sonic differences btn K42Y2 & K40Y-9 PIO caps

Posted by JoeRB on October 12, 2008 at 20:42:07:
I find there are K42Y-2 and K40Y-9 PIO capacitors and they seems to be made by the same materials. Are there any sonic differences between them. Please share your experiences.

The description said:
"The K42Y-2 are high quality PIO capacitors made for military. The conductor is made of aluminum foil and the dielectric is oil saturated paper, glass sealed in a metal body. These capacitors provide excellent sonic characteristics, high tolerance is kept within a wide temperature range."

"The K40Y-9 are high quality PIO capacitors made for military. The conductor is made of aluminum foil and the dielectric is oil saturated paper, glass sealed in a metal body. These capacitors provide excellent sonic characteristics, high tolerance is kept within a wide temperature range."