Vintage Microphoe

[sg]

Hi all , can anybody tell me exactly what the perforated material is that is used on these microphones? I need to source the same stuff, and so far have found some steel sheets but at 1mm it is too thick to easily mould to that shape. What should I bee searching for, maybe perforated tin or brass?

https://www.google.co.uk/search?q=velocity+microphone&safe=active&espv=2&;biw=1200&bih=754&source=lnms&tbm=isch&sa=X&;ved=0ahUKEwjfyP_PpenOAhWpJ8AKHSrsDuwQ_AUIBygC#imgrc=j7d-ewEUGyDq-M%3A


many thanks

[emeritus]

Dont know if this helps but there is a company here that seems to provide a large selection of perforated metal sheets.

Might be something you can use ?

http://uk.rs-online.com/web/c/abrasives-engineering-materials/mild-steel-tube-sheets-angles/perforated-steel-sheets/

[sg]

Thanks for the pointer Emeritus, I will look at their products. And to put it more simply to anyone, I need to replicate this 1930s microphone, what's the mesh made of and where can I get it? http://www.coutant.org/bbc/ Painting or spraying the metallic bronze type colour is not a problem, but I need the raw material...

[Bertrum]

It depends on what wire diameter you require this at 0.224mm but may be too fine
Amazon.co.uk User Recommendation

[gumboot]

I'd recommend you join the following forum:

http://www.vintage-radio.net/forum/index.php

These guys are excellent at sourcing old audio equipment and parts as well as repairing the stuff.

[gumboot]

I wouldn't just try to knock up a facsimile of the microphone shown in your link without specialist advice. Some issues you'd encounter include the problem of eliminating specific wavelengths around the 60Hz mark which would cause a noticeable hum. The hole size in the mesh is critical in order to prevent such wavelengths entering the mike in the same manner as the mesh size in your microwave oven hinders the escape of microwave radiation. Also, try not to use brass mesh as you're looking to make what is essentially a Faraday Cage around the mike elements. Copper mesh is far better and can be painted if necessary.

Without being aware of your expertise and knowledge of radio/electronics, it's difficult for me to point you in the right direction. However, as I said, knocking one up without some guidance is prone to failure. I'd recommend you ask the guys on the forum I provided a link to.

[gumboot]

Oops just re-read your post and noticed that you may not intend to build a working mike. In that case, the stuff you need is called Monel Mesh and is made from Monel Metal, a nickel-copper corrosion resistant alloy. That was the stuff that was used for decades on ribbon mikes. Lot's of sellers on the internet.

[sg]

Thank you all so much for your input.
Yes once again I should clarify further, I need to make a replica mic that doesn't work and is just for show during a theatrical production.
Gumboot your technical advice has been fantastic, thank you. I will look at Monel mesh, that's a fantastic link.
My preference would be for the metal sheet with holes rather than the wire network mesh but I can work with that I am sure.
Thanks everyone ,
sg