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 on: Yesterday at 07:55:14 pm 
Started by brucekaphan - Last post by uwe ret
'Purification' of the signal path? how much simpler than a single FET impedance converter can it get? With the exception of the output transformer, the single FET and its associated feedback and bias components all other parts are for filtering and stabilizing the capsule bias and impedance converter operating voltages.

 on: Yesterday at 04:28:34 pm 
Started by brucekaphan - Last post by klaus
The mentioned mod is a purification of the signal path, to bring out more of what that extraordinary capsule has to offer.

 on: Yesterday at 10:11:46 am 
Started by brucekaphan - Last post by Kai
... given no access to any KM54, I would choose a KM84 (modified, of course) or Schoeps CMC5 with MK5 cardioid capsule.
Owning and having used all of the above mentioned mics for decades (except that my KM84s are unmodded) (mainly as spot mic on instruments, not vocals) I'd say these have quite some spread in characteristics and can complement each other:

- Neumann KM54: soft and clean, mid-centric, but EQ-friendly.

- Schoeps CMC5 MK5 (cardiod setting, the capsule has an omni setting too): my long term workhorse, clear, forward and a bit bright with good amount of punchy low end, sits great in the mix without EQ.
Much better then MK4 which can sound honky at times.

- Neumann KM84: good presence without beeing agressive, remarkably silky treble.
Best of the pack for available sound capture (distant miking of well balanced whole ensemble)
What is the mentioned mod?

 on: August 22, 2019, 12:27:10 pm 
Started by radek_p - Last post by klaus
I am reluctant to disclose the next step, for two reasons. The workplace needs to be very clean; and the isolation tape which, where present, acts as additional barrier for contaminants transferring to the backplate, needs to be removed, the surfaces cleaned of its adhesive, and replaced.

If you want to experiment, and don't mind suffering collateral damage in the process, the two halves will come apart as soon as screws and tape are off. Make sure that the two guide/alignment pins inserted into the backplate stay where they are. for proper realignment during reassembly.

Remove the spacer and carefully inspect the backplate edges for damage, or for kinks in  the spacer (the original cause of the shorting).
Feel around the edge of each backplate half and make sure there are no burs. Reassemble the backplate halves and use a different position for the spacer, both rotational and front/back. Test for shorts as you tighten the screws and reinstall the capsule.

Good luck!

 on: August 22, 2019, 10:13:21 am 
Started by radek_p - Last post by radek_p
Could you please outline the procedure to separate the two capsule halves and access the spacer?

When the capsule is out of the holder and all 4 screws as well as the plastic cap (terminology?) are removed, the capsule seems still very compact.

The mic is now working, however I would like to know how difficult would be the next step if things get worse in the future.

Many thanks Klaus for invaluable information. It is interesting to start to know how things work behind the curtain (grill).

 on: August 21, 2019, 06:29:56 pm 
Started by radek_p - Last post by klaus
No. The spacer's material properties do not come into play when the backplates are shorted.

 on: August 21, 2019, 11:50:44 am 
Started by radek_p - Last post by afterlifestudios
Is it worth double checking that the spacer itself is non conductive?  (ie. nylon.)

 on: August 21, 2019, 11:22:52 am 
Started by radek_p - Last post by klaus
If the Nylon spacer has been pinched hard in the past, the next level of repair would be to take the spacer out and install it in reverse orientation, so to expose less of the pinched section to the current position on the backplate.

 on: August 21, 2019, 05:06:14 am 
Started by radek_p - Last post by radek_p
I had quite a busy evening with screwdrivers. I loosened the screws till the ohmmeter showed isolation, assembled the mike, it work for a while in fo8, then the problem went back. Disassembled, loosened even more, again the problem went back. Then I removed the 4 screws entirely, removed the capsule from the holder and let it rest this way over the night. Assembled this morning but rotated the capsule 45 or 90 degrees in the holder. All screws tightened just very lightly. It is still working now, but apparently the capsule needs some professional treatment (it probably has not been touched for 40 years)

Many thanks, Klaus.

 on: August 20, 2019, 12:32:33 pm 
Started by radek_p - Last post by klaus
The four backplate mounting screws are not intended to determine diaphragm tension, or affect capsule parameters, as long as you don't crank them like mad. In that case, there may be mechanical distortion.

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