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Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by klaus on June 29, 2018, 07:15:59 pm »
Bruce,
It's forthcoming, in about a week. Lots of surprises, too!
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Klaus Heyne's Mic Lab / Re: Neumann reissues the U67
« Last post by brucekaphan on June 29, 2018, 06:33:21 pm »
Is Klaus' U67 reissue review still forthcoming, or has he done it already and somehow I missed it?
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In any case I'm glad to be here to face the facts (in spite of these disappoint my expectations). Education first. Thank you Mr. Heyne.
14
I sympathize with your predicament, and am afraid the news is not good for you and anyone who hopes that the same capsule installed in the $7k U67 will be better or different than when it's installed in the $3.5k U87Ai.

If my complete tear down and analysis of the U67 reissue (article currently in progress and posted soon) is any indication, the ills that plague the K67/870 capsule have not been cured: high diaphragm tension on still too many of them.

Though there is a way to reduce the tension and, for a balanced response, bring it into a range of past generations, it is laborious and expensive.

15
Yes, it is. And this mic's response, as that of the U87Ai, therefore is largely affected by the individual response of the actual capsule installed.

Thank you. Then my hope is the new batches of capsules of a $7K mic should be better in terms of consistency. I really don't know if I should buy a new K870 for my 1961 U67, wait a little more, or try a vintage second hand and cross fingers (even though, at this point, all choices seems a cross-fingers-matter to me!).
16
Yes, it is. And this mic's response, as that of the U87Ai, therefore is largely affected by the individual response of the actual capsule installed.
17
Thank you for such invaluable info. Is the capsule in the new U67 reissue the K870/K67? (as far as I know, there is no new capsule available as spare on the Sennheiser site).
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Klaus Heyne's Mic Lab / Re: KM84 Low output suddenly
« Last post by BluegrassDan on June 26, 2018, 07:49:43 pm »
Thanks, Klaus. The transformer is dead.  UGGGH!

Know where I can find one easily, or do I just need to scope eBay and forums?
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Klaus Heyne's Mic Lab / Re: KM84 Low output suddenly
« Last post by klaus on June 26, 2018, 12:17:39 pm »
The white wire is the inner connection between the two primary bobbins, and as such not a reliable way for a layperson to judge the primary.

Instead, unsolder the red wire from the circuitboard, and check between it and ground (where teh primary's black wire terminates) with an ohm meter for continuity, or measure roughly 600Ω.

If that connection is open, you have indeed a break in the primary wire, which renders the transformer dead.
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Klaus Heyne's Mic Lab / Re: KM84 Low output suddenly
« Last post by BluegrassDan on June 25, 2018, 10:19:53 pm »
Okay. I have replaced the jfet, caps, and zener. Still the same issue.

There appears to be no continuity between the red and white wires of the transformer primary.

Could lightning have caused this?

What is the solution? New transformer? How hard of a job is that?
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