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Author Topic: U89i Center Screw Inside  (Read 3359 times)

hasbeen

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U89i Center Screw Inside
« on: June 29, 2012, 10:29:33 PM »

You know, the screw in the center of the circuit board inside the Neumann U89i? Next to T4 and T5?

What is that for adjusting?


Thanks
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Who Is John Galt?

klaus

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Re: U89i Center Screw Inside
« Reply #1 on: June 29, 2012, 11:14:28 PM »

Looking at my U89 schematics, I do not see a trimmer for resistance or capacitance adjustments. 

As I don't have a U89 here currently, could you show a close-up photo of the part in question?

Thanks,
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Klaus Heyne
German Masterworks®
www.GermanMasterworks.com

hasbeen

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Re: U89i Center Screw Inside
« Reply #2 on: July 08, 2012, 05:51:26 PM »

My mistake. I was wondering what the circular component is above C19? Thanks!

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Jim Williams

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Re: U89i Center Screw Inside
« Reply #3 on: July 09, 2012, 01:42:57 PM »

That is a ferrite cored transformer for the polarization oscillator. It has no adjustments and should not be touched unless you want to break it. That pcb is the rest of that circuit. The audio part is on the other pcb.
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hasbeen

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Re: U89i Center Screw Inside
« Reply #4 on: July 09, 2012, 06:31:07 PM »

Thanks!
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