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 21 
 on: August 20, 2019, 09:16:38 am 
Started by radek_p - Last post by mikezietsman
Klaus,
Does the tension between the two back plates (ie. the tightness of the four bigger connecting screws) not have an effect on the sound of the capsule?

Thanks,
Mike


 22 
 on: August 19, 2019, 08:52:17 pm 
Started by radek_p - Last post by klaus
The photos show a U87, not U87Ai head.

The problem you describe-shorting of the two backplate halves-is not unusual on the original KK87 capsules: the 40Ķ Nylon spacer that separates the halves gets pinched sometimes and one or both slightly burred, irregular brass ridges at the edge of the back plates touch the opposing surface: the halves are no longer isolating.

Temporary solution (vs. professional solution of deburring the backplates and replacing the spacer): losen the four backplate screws (two in front, two in back) enough, so that you can move the backplate halves a bit back and forth. Now slightly tighten the four screws back up, and observe with an ohm meter that the short does not return as you tighten up. If it does, back up one or several screws enough to get full isolation.

 23 
 on: August 19, 2019, 08:16:17 pm 
Started by radek_p - Last post by afterlifestudios
I canít tell from the thumbnail photos (Iím on my phone) but are you certain itís a k87 capsule and not a k67/870 capsule?  (The k67/870 backplates are connected.)  They are used in u67 and u87ai.

You donít show what mic body you have, but your schematic is for an original u87 (non a) so you must use a k87.




 24 
 on: August 19, 2019, 07:13:50 pm 
Started by radek_p - Last post by radek_p
Dear folks, dear Klaus,

I'd like to ask you for some generous help with my U87.

It works fine in cardio and omni (consistent sound from front, rear and sides). In 8 position however, it gives weaker signal from front and almost no signal from the rear side.

When I test my head with another body, the problem remains the same. When I connect another head to my body, it works fine. I.e. the body can be ruled out.

I measured 0 Ohm between pins 2 and 5 when the head is disconnected from body. It is 0 Ohm regardless of the pattern selected. I also removed the grill and disconnected one of the two backplate wires, still 0 Ohm between the two backplates. By this I believe I ruled out the pattern selector switch.

Is there anything I can do to renew the isolation between backplates?

U87 #32337
head KK 87 B #11201

photos attached
schematics attached for your convenience

Many thanks, Radek

 25 
 on: August 14, 2019, 03:47:47 pm 
Started by Nobtwiddler - Last post by GeraldSpray
Well, if the question is only in this type of beverages, you are welcome to make sure in every part of the work itself.

 26 
 on: August 13, 2019, 07:17:43 pm 
Started by mfassett - Last post by GeraldSpray
Well, I want to know several types of the mentioned work, as well.

 27 
 on: August 13, 2019, 07:15:52 pm 
Started by klaus - Last post by GeraldSpray
Well, I think such type of micro is not a problem to find. But if anybody has stolen it already...

 28 
 on: August 10, 2019, 07:45:27 pm 
Started by mikezietsman - Last post by klaus
Perfect explanation. Nothing to add.

 29 
 on: August 10, 2019, 12:29:56 pm 
Started by mikezietsman - Last post by afterlifestudios
Maybe Klaus can refine the details, but hereís how I do it in u67ís:
Take a pair of snips and snip the ďtop left cornerĒ of the s2 jumper.  Bend the newly snipped horizontal piece of the jumper wire up away from the board and affix it to the back of the tube socket with a tiny drop of glue. (So the snipped piece of wire is not loose in there and wonít make contact with anything conductive.)
Then if you want to put it back to stock, you can just bend the jumper back into place and solder the corner that you snipped...

 30 
 on: August 10, 2019, 05:00:25 am 
Started by mikezietsman - Last post by mikezietsman
Good Day,

I'm embarrassed to admit that I do not know how to disable the inbuilt HPF in my stock u67/m269 mics.
I have searched for several manuals and while they all make a mention of it, none offer practical steps needed to safely disable the HPF. There are references to "opening s2". In my past experience, a user adjustable feature like this would involved moving a jumper, but from what I can tell this involves either some snipping or de-soldering... and I would HATE to do it incorrectly...

What are the proper, practical steps to disabling the inbuilt HPF on these microphones?

As always,
Thank you!
Mike

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