[Amps] Amps Digest, Vol 43, Issue 138

[Will Matney]

Borislav,

I've never heard of any issue either. I remember when they were being used, even into the 70's. Probably some are being used today. In a lot of the old magazines, you would see photos of operators wearing them if I recall.

Best,

Will

*********** REPLY SEPARATOR  ***********

On 7/25/06 at 1:38 PM Borislav Trifonov wrote:

>The stators are around each membrand and their DC bias is at zero volts, 
>so they effectively shield the head from any potential (plus, the 
>membranes are both at the same voltage, so there's no differential 
>around the head).
>Electrostatic headphones have been around since at least the 50s and 
>they continue to be sold commercially, and I've yet to read about there 
>ever being a health issue.
>
>
>> Message: 2
>> Date: Tue, 25 Jul 2006 14:04:36 -0400
>> From: "Will Matney" <craxd1 at verizon.net>
>> Subject: Re: [Amps] Amps Digest, Vol 43, Issue 134
>> To: amps at contesting.com
>> Message-ID: <200607251404360450.00E4A74F at outgoing.verizon.net>
>> Content-Type: text/plain; charset=us-ascii
>> 
>> Bill,
>> 
>> Yes it looks that the 550 Vdc is a bias. The other current applied to
>the stators would be at audio frequency. As long as there's enough
>insulation between the ear and the diaphram, it shouldn't reach out and
>grab ya, Hi Hi! It is enough to make one think though when wearing them,
>LOL!! Maybe there should be a warning that says "Do not use after
>swimming"....
>
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