TheMilford wrote:I soldered the yellow wire to pin 2 and the green to pin 3... I can always swap them later.

you can download the manual for the M160 here.
the spec sheet says ge(yellow) pin 2. bl(blue) pin 3.

bassdriver wrote:

TheMilford wrote:I soldered the yellow wire to pin 2 and the green to pin 3... I can always swap them later.

the spec sheet says ge(yellow) pin 2. bl(blue) pin 3.

Green is on the +ve side of the secondary on that diagram. The Beyer mic trafos have dual or split secondaries from what I can remember, so I'd guess that green will maybe be what you want on pin 2. You can test this yourself though as you say.

Don't worry too much about connecting the multimeter. It's just risky.

well... one is clearly yellow but the other could a blue that has aged to green.

I think this mic is from the 70's.

I think there are two copper wires twisted together inside the mic... but it's hard to see.

TheMilford wrote:I think there are two copper wires twisted together inside the mic... but it's hard to see.

Those are probably enamel-coated wires running to the motor.

Any thoughts on the green/blue wire?

TheMilford wrote:Any thoughts on the green/blue wire?

I would just follow the Beyer spec. sheet guide for one of the wires and then test for the mean time. I'm not in London just now, so I can't find the transformer spec. sheet (nor on the net), but I'll look for it when I get home.

how do I test for correct polarity/phase of this mic?

TheMilford wrote:how do I test for correct polarity/phase of this mic?

Get another mic, strap it alongside your M160 so as the transducers are more or less aligned, then record some sort of impulse - say a sine tone or a snare. Now check the relative phase (well, polarity) on a wave editor.

Alternatively, keep them together and aligned as before, and speak into them whilst listening to both bussed together. You'll notice if the M160 is out of phase - flip the phase switch to check.

Rodabod wrote:

TheMilford wrote:how do I test for correct polarity/phase of this mic?

Get another mic, strap it alongside your M160 so as the transducers are more or less aligned, then record some sort of impulse - say a sine tone or a snare. Now check the relative phase (well, polarity) on a wave editor.

Alternatively, keep them together and aligned as before, and speak into them whilst listening to both bussed together. You'll notice if the M160 is out of phase - flip the phase switch to check.

great. your posts in the tech room are always interesting to read and very helpful. thanks rody.

Ok so I think my M 160 is blown... no sound come out.

If I shake it a little there is a rattling sound coming through electronically but I don't here is acoustically.

Beyerdynamic gave me the number for The Sound Surgeon. Are they reliable?