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 on: November 30, 2019, 01:40:48 pm 
Started by Noah Scot Snyder - Last post by David Satz
As an update and partial correction: The M 221 had numerous sub-types and variants, each with several types of interchangeable capsules available. There were two physical attachment schemes: The original M 221, the M 221 A and the M 221 F used coarse threads that faced outward on the capsule housing. The M 221 B used fine threads that faced outward on the amplifier housing, like those of the Colette series today.

Meanwhile, either 60-Volt or 120-Volt polarization was used in different models of the series: The original M 221, most M 221 B, and all M 221 F used the 120-Volt plate supply to polarize the capsules. The M 221 A, the M 155, and a few Siemens-labeled M 221 B amplifiers used a voltage divider to bring this voltage down to 60 V, and of course the corresponding capsules were built to operate at that lower voltage.

The threads of the M 221 A and M 155 may have differed enough from those of the original M 221 to prevent capsules of either type from being used on the other type's amplifiers; Telefunken's brochure for the M 221 A says as much, but I'm still looking to establish it for sure either way. Since the M 221 A and M 155 capsules were designed for 60 Volt polarization while the original M 221 supplied 120 Volts to the capsules, it would be very bad particularly if capsules of the later type could be used on the earlier type of amplifier.

--best regards

 on: November 30, 2019, 04:07:33 am 
Started by RuudNL - Last post by RuudNL
I already gave the microphone back to the owner. But the components look like (black) SMD resistors.

 on: November 29, 2019, 12:15:05 pm 
Started by RuudNL - Last post by klaus
Close-up photos, please!

 on: November 29, 2019, 02:34:56 am 
Started by RuudNL - Last post by RuudNL
It is indeed possible that they are chokes. The one that wasn't broken measured a very low resistance (that is why I assumed they were 0 ohm resistors). But... it is a strange construction and makes the microphone very fragile.

 on: November 28, 2019, 06:47:51 pm 
Started by RuudNL - Last post by uwe ret
The broken components are most likely SMD RF-chokes from an aftermarket modification. They may have been added in an attempt to ameliorate RF-interference.

 on: November 28, 2019, 12:03:01 pm 
Started by RuudNL - Last post by klaus
It's a pretty rare and obscure model. I will take a look at the schematic and try to identify the section of the circuit that corresponds to your description.

 on: November 28, 2019, 03:52:57 am 
Started by RuudNL - Last post by RuudNL
Recently I was given a Neumann KMS84 microphone that had been dropped on the floor.
The microphone did not produce any sound.
When I opened the microphone, I noticed that the wires to the XLR insert were not directly connected to the PCB, but through 0 ohm SMD resistors. One side of the SMD resistors were soldered to the PCB and the wires were soldered to the other end of the SMD resistor.
Because of the shock some SMD resistors had broken and interrupted the connection to the output.
What could be the reason for using these (fragile) SMD resistors in series with the output wires?
I soldered the wires directly to the PCB and everything is now working as it should.

 on: November 11, 2019, 10:22:22 am 
Started by klaus - Last post by Eddie Eagle
The rest of us will have to do with voices, sometimes our own...
I resemble that.

 on: November 11, 2019, 01:16:01 am 
Started by gsherman - Last post by saltyjames
AKG C414 XLS are excellent mics.

 on: November 10, 2019, 01:22:23 pm 
Started by klaus - Last post by klaus
(...) I feel the cello is a perfect instrument balance wise to give me a clear idea of how the mic responds.(...) there is no instrument that affects me emotionally like the cello.

I am not the first to note the similar timbre and expression of a cello and the human voice. It's therefore an excellent instrument to judge a mic, as Alan notes. It is enviable to work in a recording environment where cellos are common. The rest of us will have to do with voices, sometimes our own...

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