Neumann Vintage U87 Clone : Build Thread.

[Matador]

I meant which capsules and transformers you will use,pardon my bad english,still learning....

Oops, my fault you asked very clearly.

I'm using two K67 type capsules matched by Dave Thomas at AAMicrophones.  They are essentially the same as those sold by Microphone Parts, but they are re-skinned with 6 micron Mylar.  They should have slightly less high frequency lift in the 7-9kHz range as a typical K67 type capsule.  Since I already have two "dark" versions using K47 type capsules, I'm hoping this pair has slightly more "air".

More sonic crayons to add to the box!

 

[kante1603]

Cool,thanks!

Udo

 

[poctop]

+ 1 Matador for Matador 

Dany,

 

[sr1200]

I know this is almost blasphemy, but I used mine in front of a kick drum (with the pad on about a foot infront of the front skin) HOLY HUGE KICK DRUM SOUND!!!!

 

[kante1603]

I know this is almost blasphemy, but I used mine in front of a kick drum........

Yes.

 

[HellfireStudios]

I know this is almost blasphemy, but I used mine in front of a kick drum........

Yes.

Not when used with a pop filter in front of it...

 

[kante1603]

Not when used with a pop filter in front of it...

Right,and one can use a U47 as a salt shaker and a CMV3 as a rolling pin......

 

[HellfireStudios]

Not when used with a pop filter in front of it...

Right,and one can use a U47 as a salt shaker and a CMV3 as a rolling pin......

Even a ribbon, which is known for its fragility, can be used in front of a kick, if the air blast is properly dissipated/absorbed, and can take the SPL. A pop filter does the former very well. Notice how I didn't say INSIDE a kick drum? The pressures all around the capsule would be ridiculous for a condenser mic, and no pop filter is going to be sufficient for the job.

-James-

P.S.- The badge on a CMV-3 would make it difficult to use it as a rolling pin, and the U-47 would require a total redesign to implement a salt shaker-style operation.

 

[kante1603]

Even a ribbon, which is known for its fragility, can be used in front of a kick, if the air blast is properly dissipated/absorbed, and can take the SPL. A pop filter does the former very well. Notice how I didn't say INSIDE a kick drum? The pressures all around the capsule would be ridiculous for a condenser mic, and no pop filter is going to be sufficient for the job.

I know how to choose and use microphones....

P.S.- The badge on a CMV-3 would make it difficult to use it as a rolling pin,

...but makes pasta dough quite unique....

and the U-47 would require a total redesign to implement a salt shaker-style operation.

...leave out the innards,especially the mounting plate for the capsule,fill in the salt before assembly,done....

Completely OT again.....

 

[HellfireStudios]

Wouldn't salt leak from the side grills, as well?

Let's move on to more relevant topics. Like the thread at hand.

-James-

 

[kante1603]

Wouldn't salt leak from the side grills, as well?

Let's move on to more relevant topics. Like the thread at hand.

-James-

Yes. ;D

 

[Hank Dussen]

I think I managed to bias the FET. But since the IDss of all (5) my FET's are rather high (around 12) the voltage at the drain is rather low.
Maybe it would be better to to have some FET's with a lower IDss.
Instead of having to buy another 50 or so is anyone willing to sell me 2 of their leftover but 'within specs' FET's?

Pieter

 

[kante1603]

I think I managed to bias the FET. But since the IDss of all (5) my FET's are rather high (around 12) the voltage at the drain is rather low.
Maybe it would be better to to have some FET's with a lower IDss.
Instead of having to buy another 50 or so is anyone willing to sell me 2 of their leftover but 'within specs' FET's?

Pieter

PM sent!

Udo

 

[geekmacdaddy]

Got the mic together sans capsule (I'll do that last, as I don't want to keep it exposed any longer than needed), here's some photos;

Having a problem biasing. I have one audio track in logic with a tone recorded to it. This is being outputted via out 1, which has a mono 1/4 in plug going into 2 wires w/alligator clips. Those are connected to; a) rail of the mic chassis, b) R6 directly. The mic is routed to track 2's input. I have pulled up a software oscilloscope in track 2. Problem? No signal in to track 2. Just a bit of low level hum. I'm doing something stupid, I'm sure...(Yes, track 2 is in record) Thoughts?

Thanks in advance
Geek

 

[tskguy]

Geek,

Have you set the voltage at the drain? I would start with around 11.5v or so. Its a good place to start. It will also verify that the circuit is working.

Eric

 

[HellfireStudios]

Geek,
You are not supposed to use the mic's XLR output for biasing. Make another gator clip cable, and attach the positive side of the cable to the drain of the FET. The negative to the mic's ground. That should help. This info alluded me too.

-James-

 

[geekmacdaddy]

Thank you James and Eric. Back to the "real" world for another couple of days, then I will have at it again. Eric, I may collect on that phone call sometime soon...

 

[tskguy]

Anytime,
I will be around all weekend! ;D

 

[HellfireStudios]

None of the good deals on evibay for oscilliscopes include probes (I will be lucky, if I get a power cable), and the probe selection on evilbay is somewhat slim at the moment. Which probe (10x or 100x) do I need to bias this mic? Does the MHz rating on the probe need to match the scope (150MHz)? If I get a Tektronix scope, do I need Tektronix probes? If there are "universal" probes, where do I find them as cheaply as possible (my budget is strained at the moment)? Thanks.

-James-

 

[Beeswax]

Would the Mxl V6 body accommodate the build?