[Tech1] Sanitizing a mic.

[Roger E Long]

Im amazed you got away with this Pat
The MKH 125 was a full RF capacitor mic. The electronics were in a head amp separated from the  capsule with unbalanced cable
It was a version of the MKH 405 , a cardioid TPower boom mic of v  high quality.
Normally dynamic mics were put in a condom for underwater FX. (AKG D109, Sennhieser D211)
That a RF omni condenser survived is testament to its construction.
They were lovely mics , with a gentle rising presence, but expensive compared with dynamics and electrets.
I have 6 of them still.
Hydrophones are P48 powered, DPA do a cracker, but they are heavily shrouded and the cable armoured to withstand sea water and pressure.
Roger

> On 18 Dec 2020, at 21:37, patheigham via Tech1 <tech1 at tech-ops.co.uk> wrote:
> 
> Alan’s mention of cling film reminds me of a need to waterproof a mic to obtain some underwater effects in a swimming pool. Using a Sennheiser MKH 125, their lavalier personal mic of the day, see attached photo, there is a raised rim around the diaphragm. Stretching cling film, tightly, over it and swathing  it in Blutac was eventually very successful. The first attempt flooded the mic, so it was dismantled and allowed to dry out in the sun.
> It sounded good in the open-air, so I surmised that the outer covering of clingfilm acted as a primary diaphragm, and
> the air trapped between that and the real diaphragm was working as a linking piston. In this case, the film was not close to the real diaphragm, so was not obscuring the holes, due to the design of the casing with the rim feature. 
>  
> With regard to sanitising the lip ribbon – maybe a replaceable mask filter can be applied above the nose shield, but probably too dense a material to place over the diaphragm entry, unless it’s sound transparent enough. More experimentation needed, methinks.
>  
> Pat
>  
> <4D56339BBBF14016B480CC0F20C23E9D.jpg>
>  
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>  
> From: Alan Taylor via Tech1 <mailto:tech1 at tech-ops.co.uk>
> Sent: 18 December 2020 16:48
> To: Tech-Ops-chit-chat <mailto:tech1 at tech-ops.co.uk>
> Subject: Re: [Tech1] Sanitizing a mic.
>  
> Cling film can achieve a similar result, with the advantage of staying in place and looking fairly inconspicuous, although it’s not particularly durable. Peeling it off can be fiddly, but I use slips of paper as identification labels and put them discreetly just under the last layer of wrap so that if you peel from there, it comes off easily. 
>  
> Alan Taylor
>  
>  
>  
> 
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