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Old 17th June 2020
Lives for gear
M7 vs k47 capsule

google will have some of the answers..

I’m sure there are audio comparisons online. Whether or how representative they are may be a different story. Most, or all original M7 capsules are in an advanced state of decomposition and well out of spec, with the freshest batch of gefell m7’s using the original formulation dating back to 2006 I believe.

I’m only relating from memory what I’ve learned round these parts and Klaus’s forum at psw