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 91 
 on: December 31, 2019, 01:18:25 am 
Started by afterlifestudios - Last post by afterlifestudios
Thank you, Klaus.  In the process of swapping capsules I noticed two things.
1. the "pin" from the capsule was quite black on one mic.  (Cleaned it.)
2. On one mic, the two sides of the "female" receptacle for the capsule pin were bent slightly, and the pin was actually not going in between the two sides.  Just pushing up against the outside of one side.  I carefully bent them back into canter so the pin now inserts between them.

The mics are now 3-4db and 4-5 db below the 184.  (the difference follows the capsule.)

This is with fairly crude measurement technique.  (1khz tone from speaker with mics on quick clips on the same mix stand.)

 92 
 on: December 31, 2019, 12:07:39 am 
Started by afterlifestudios - Last post by klaus
Interchange capsules and see whether the lower output of the second KM84 follows the capsule, or stays with the mic amp.

 93 
 on: December 30, 2019, 11:57:13 pm 
Started by afterlifestudios - Last post by afterlifestudios
Update.  I severed the solder blob between the two traces in the above photo.  Now I have the correct level!  (about 3db down from km184)

BUT...  That's only one of the km84's.  The other mic, the 47ohm pad resistors are gone and the traces are bridged cleanly.  Something else is causing the problem in this one...  Anywhere to start looking?

 94 
 on: December 30, 2019, 11:15:37 pm 
Started by afterlifestudios - Last post by afterlifestudios
Thank you, gentlemen.  The 47ohm resistors have been removed and the traces have been bridged with solder.  But the work is sloppy, and the two traces are actually bridged.  (continuity on DMM)
That can't be right?

 95 
 on: December 30, 2019, 10:01:58 pm 
Started by afterlifestudios - Last post by klaus
If the output is indeed 10dB higher, the remaining ca. 6dB difference could stem from the inline soldered pad resistors soldered onto the circuitboard of the KM84.

Make sure their solder tabs (backside of the component side of the circuit board) are bridged with solder, not open. In case of doubt, measure the resistance across both 47Ω pad resistors (R11, 12). It should be zero ohms for full, European-delivery output strapping.

 96 
 on: December 30, 2019, 08:19:11 pm 
Started by afterlifestudios - Last post by David Satz
The sensitivity of the KM 84 (standard 200 Ohm setting) was specified as 10 mV/Pa. That of the KM 184 is 15 mV/Pa, which is only about 3.5 dB greater--not 10 dB.

--best regards

 97 
 on: December 30, 2019, 03:17:10 pm 
Started by afterlifestudios - Last post by afterlifestudios
I have a pair of km84i.  Both mics are strapped for 200ohm.  The switchable 10db pad circuit is intact and functioning, but switched off currently.  (ie. no attenuation.)
Both mics are about 10db lower output/sensitivity than my km184.  (20db lower if pad engaged.)
Is this difference in output level/sensitivity between km84 and km184 expected?

(update: I do not think these have the internal resistor pad installed.  photo attached.

 98 
 on: December 30, 2019, 01:23:11 am 
Started by halsalarm - Last post by klaus
Quote
Since the seller is quite established for years, quite an expert in vintage microphones and has assured me that it's still the original capsule and demanded a pretty steep amount of money for it, however, i am disappointed to say the least...

Boy, that's going to make me really popular with yet another seller.
But repentance, before it's too late, can turn things around- from the gods of greed to those of redemption, kindness and honesty!  (Or just watch "Uncut Gems").

 99 
 on: December 29, 2019, 11:51:59 pm 
Started by halsalarm - Last post by halsalarm
Dear Klaus,
Thank you for the quick and thorough reply.
Please excuse my unprecise language here, butcher-party refers to the fact, that somebody worked with a lot of glue at the area where the three screws at the bottom hold the capsule in place and to the at least partial strange looking soldering.
Your remarks concerning the deteriorating plastic and the replacement k87 support my impression that somebody put a replacement capsule on the original already worn out head assembly.
Normally not a big deal, if the mic sounds ok, i simply do not care much. Since the seller is quite established for years, quite an expert in vintage microphones and has assured me that itīs still the original capsule and demanded a pretty steep amount of money for it, however, i am disappointed to say the least, especially since i absolutely value honesty.  I‘m ready to pay good money for good quality, thatīs the reason i rarely buy microphones on ebay. But for future buys i will do it the old school way: have a personal look at the microphones and test them in place.
Thank you again for your assessment! All the best,
Christoph

 100 
 on: December 29, 2019, 10:59:56 pm 
Started by halsalarm - Last post by klaus
So, what were you referring to as "wildstyle diy-butcher-party"?
To me, it just looks like a good old 1998 replacement K87, with someone writing over the original blue ink with a bigger blue pen.

What's more interesting to me is the head assembly with its deteriorating plastic: notorious for mid-to-late 1970s KK87.

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