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Post by ben on Aug 1, 2014 17:17:37 GMT -6
So, in my research to build a U67 clone, I find that the u87ai and the K67 are the same capsule, at least, the new ones from Neumann. The headbasket on the U87ai is easily removable from the body. So, how cool would it be to build a kit that would accept the U87ai head? You could have a U67 or whatever other circuit you want, with that capsule. Many people give the U87ai a bad rap (not me, I like mine) and this seems like a good way to give ai owners a bit of versatility. I know innertube audio made a version, but I think that was for the older u87s. Though I can solder like a mo-fo, I can't design a circuit at all, so I must leave the hard work to one of you fine minds, but I think it's a cool idea.  |
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Post by svart on Aug 2, 2014 9:21:42 GMT -6
So essentially exchangeable capsules for different bodies? It's a cool idea and a few have done similar things, like Blue, Gefell and Oktava with different capsule heads for their bodies. The only problem is that the increased expense for enclosed capsules, threaded bodies, etc, is generally too expensive for the DIY'er and the general public doesn't seem terribly interested in it.
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Post by jimwilliams on Aug 2, 2014 11:53:41 GMT -6
I have k-67 and k-87 clone capsules here. They won't sound like a U-87 unless you use the same high feedback single jfet design and a similar output transformer. They will sound more like a TLM version in a mic body without the transformer.
No matter, it's still a very usable design.
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Post by ben on Aug 2, 2014 17:31:20 GMT -6
So essentially exchangeable capsules for different bodies? It's a cool idea and a few have done similar things, like Blue, Gefell and Oktava with different capsule heads for their bodies. The only problem is that the increased expense for enclosed capsules, threaded bodies, etc, is generally too expensive for the DIY'er and the general public doesn't seem terribly interested in it. More like the U87ai head, and you can swap out the innards. I'd get a kit like that if it were available, and there are thousands of Ai owners out there that may do the same. I understand that the law of equities applies, though. Just daydreaming outloud. |
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Post by jimwilliams on Aug 4, 2014 11:23:31 GMT -6
I found the aftermarket Chi-com k-67 and k-87's to sound a bit different as well. The construction difference is a dual vs single backplate design. The dual backplate k-87 is a bit more brite than the single backplate k-67.
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ericn
Temp
Balance Engineer
Posts: 16,107 
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Post by ericn on Aug 4, 2014 18:16:34 GMT -6
I found the aftermarket Chi-com k-67 and k-87's to sound a bit different as well. The construction difference is a dual vs single backplate design. The dual backplate k-87 is a bit more brite than the single backplate k-67. Hey Jim Since you are no longer doing mods how about a tutorial on how to give The Vintagemicrophonepcbs.com board your special treatment! |
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Post by carival on Aug 7, 2014 21:59:19 GMT -6
Inner tube audio does make a retro fit for the u87ai as well as the u87i. very open sounding with good headroom and tons of output. not similar to a u67 though.
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