R/E/P > Klaus Heyne's Mic Lab

Improving Gefell UM92

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Klokkern:
Hi all

I have decided to try to improve my UM92. As far as I know of, the first thing I should do is change the tube to a good quality NOS tube. I have just bought one from ebay, which I hope will work well.

  http://cm.ebay.com/cm/ck/1065-29392-2357-0?uid=101529067& ;amp ;amp   ;site=0&ver=EOIBSA080805&lk=URL&Item=26020944557 9

I am in no way capable of determining if this is a good tube from looking at the pictures, so if anybody out there can tell from the pictures if this is a genuine telefunken tube or just a rebranded lower quality tube (meaning I have spent my money in a silly way...), I would be happy to know.

Apart from upgrading the tube, the output transformers were improved from the UM92 to the UM92.1, so I guess an upgrade in my mic would also be a good thing. The first thing that comes to mind is to get a Lundal transformer ( http://www.lundahl.se/ ). Does anybody have any other suggestions on this??

As most of you have already guessed, I am NOT going to do this myself, so this thread is meant to be forwarded to the SLIGHTLY more skilled guy who will help me with this.

Thank you!

LarsK

Klokkern:
....I forgot the reason for posting this....

Does anybody have other improvment suggestions while I am at it??

lk

Barry Hufker:
If you search Klaus' forum you'll find a lengthy and extremely helpful discussion on modifying the UM92.1S.

Klokkern:
I did (and found the thread where you did a mod on yours, one of the reasons I decided to upgrade tube & transformer on mine), but since this is an UM92 and not UM92.1, I thought there might be more / other things I could improove too:o)

compasspnt:
The big change can come from transformer and electronics, including the valve.

Oliver has a lot of good changes to do.

He is highly recommended for this.

And of course Klaus, as always.

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