Coop

Blue Bluebird to Neumann CMV563/UM57 MOD
« on: December 19, 2020, 09:35:54 AM »
Hi All,

I recently cleaned up my mic collection and found the first ever large diaphragm condenser mic I bought. A Blue Bluebird. Did have some great time with this mic but I always found it sounded a little bit harsh.
Haven't used it in a while and I thought it would make a nice donor body for a CMV563/UM57 build.

So my idea is to implement a the UM57 circuit in the body with a nice M7 style capsule in the original head basket.

So I will basically have a Mic that looks like a CMV563, always liked the look of it, with the ability to switch between different polar patterns.

Right now I'm looking into sourcing all the components for the circuit and build a prototype point to point board and pair it with the stock Blue capsule and one of my N61 PSUs I have from my M582.

Will post some pics in the next couple of days. And I'm open to ideas and suggestions.

Best wishes,
Johannes


Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #1 on: December 19, 2020, 11:20:24 AM »
What tube do you plan to use?  It looks like a 12AT7 might work to replace the EC92.  The AMI UM351 seems like the transformer to use, or do you have another one in mind?  I might try building one of these next year, since I have lots of NOS 12AT7 tubes to try.

Coop

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #2 on: December 19, 2020, 11:38:58 AM »
Well I think I will use a NOS Telefunken EC92. Do have one laying around from one of my M582s that I can use as a test tube.
I was thinking about the AMI UM351. But I also heard that someone used the Cinema 2480. Need to do some more research on that. Would love to find the most parts located somewhere here in Europe.

Recording Engineer

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #3 on: December 19, 2020, 02:42:00 PM »
Can also use a BV08-type... If it’ll fit. I’m thinking about that (since I’ve a number of them from various manufacturers), but with an Amperex 6084 tube since I have a couple of those laying around also.

mjrippe

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #4 on: December 19, 2020, 02:50:46 PM »
No point in using a 12AT7 when you only need a single triode.  EC92/6AB4 are not expensive.

Pip

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #5 on: December 19, 2020, 05:09:38 PM »
I want to know if you can even open it up, because if it is anything like the baby bottle its glued shut!
Pip
New York City
http://geosonixlab.com

Coop

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #6 on: December 20, 2020, 03:56:28 AM »
@Recording Engineer
Good to know that. There is actually a lot of space in this little mic.

@Pip
Opening it up is super easy. Just unscrew the bottom ring and you can slide of the tube.





Coop

Re: Blue Bluebird to Neumann CMV563/UM57 MOD
« Reply #7 on: December 22, 2020, 12:57:03 PM »
Bought some acrylic glas and started building the prototype boards. Now I'm waiting for the rest of the parts to arrive.






 

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