Biasrocks

U87i problem
« on: November 07, 2012, 12:40:02 PM »
Older U87i (not A), brand new Thiersh reskin capsule, Cardiod and Omni sound and react as they should. Figure 8 pattern goes almost dead.

Any ideas where I should be looking?

Pattern switch maybe?

Regards,
Mark
http://SharktankPro.com

"I'd rather use an SPX90 than a UA plugin....." Joe Barresi


bockaudio

Re: U87i problem
« Reply #1 on: November 07, 2012, 01:06:49 PM »
have you confirmed that the two backplates are isolated from each other?
Are you using a new switch assembly on an old mic?
Are there four wires going to the capsule?

Biasrocks

Re: U87i problem
« Reply #2 on: November 07, 2012, 02:18:24 PM »
have you confirmed that the two backplates are isolated from each other?

Yes, I verified that there was no continuity between the backplate halfs.

Quote
Are you using a new switch assembly on an old mic?

No, the original switch is there.

Quote
Are there four wires going to the capsule?

Yes, two to the middle of the capsule.

One to a tab on the backplate and the forth connected to the plastic tab holder going through to the backplate.


It seems that one of the backplates wasn't making a connection to the wire tab. There was a small piece of plastic under the tab which I removed and now it's making a connection. My figure 8 is still significantly lower in level.

Here's an MP3 of how it's sounding.

http://Sharktankpro.com/Media/U87-Test.mp3

Cardiod, Omni, Figure 8

Regards,
Mark
« Last Edit: November 07, 2012, 02:59:02 PM by Biasrocks »
http://SharktankPro.com

"I'd rather use an SPX90 than a UA plugin....." Joe Barresi

MatthisD

Re: U87i problem
« Reply #3 on: November 07, 2012, 08:27:18 PM »
Hello Mark, I would check C2 and R4, if either of those are problematic it could be causing loss of capsule voltage through R1 when switched to figure 8.


 

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