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Headset repair

 
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echristley(at)att.net
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PostPosted: Mon Mar 23, 2020 11:44 am    Post subject: Headset repair Reply with quote

I've got a pair of Telex Echelon's, and the mic has stopped working on them. Even though they're 20 years old, they are in excellent shape other than the mic.

Does anyone know where could I find replacement parts or information on how to repair the mic?


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PostPosted: Mon Mar 23, 2020 11:59 am    Post subject: Headset repair Reply with quote

https://telex.com/aviation-solutions/support-and-services/repair-and-exchange/

Telex has an excellent repair center. I'd start with them.
On Mon, Mar 23, 2020, 12:51 Ernest Christley <echristley(at)att.net (echristley(at)att.net)> wrote:

Quote:
I've got a pair of Telex Echelon's, and the mic has stopped working on them.  Even though they're 20 years old, they are in excellent shape other than the mic. 

Does anyone know where could I find replacement parts or information on how to repair the mic?



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ceengland7(at)gmail.com
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PostPosted: Mon Mar 23, 2020 1:40 pm    Post subject: Headset repair Reply with quote

On Mon, Mar 23, 2020 at 2:51 PM Ernest Christley <echristley(at)att.net (echristley(at)att.net)> wrote:

Quote:
I've got a pair of Telex Echelon's, and the mic has stopped working on them.  Even though they're 20 years old, they are in excellent shape other than the mic. 

Does anyone know where could I find replacement parts or information on how to repair the mic?



Not familiar with that particular model, but back when I was using OTE headsets, just about every company used the same 'footprint' mic. I've had good luck just hitting up one of the less-than-major headset companies for a replacement. I've even gotten one for free, IIRC. See if this link matches what you have:
https://www.ebay.com/itm/1-Vtg-ASTRCOM-10927-Aircraft-Aviation-Wire-Frame-Boom-Microphone-for-Headset/273614720674?hash=item3fb4b54ea2:g:~dkAAOSw0HlbwiXj
All the versions I've seen have a 2 pin plug on the mic cord that plugs into the mic and is then secured with 2 set screws.
I just searched for 'aviation headset replacement microphone'. 
Here's a link from Pilot Mall for one that's a bit more expensive:
https://www.pilotmall.com/products/pilot-usa-david-clark-h10-76-conversion-kit-pa-75-pa-5x?_pos=17&_sid=5ee04d448&_ss=r

Notice that it's identical, even though it's a replacement for a different headset.
Most (not all) have a gain adjustment trimpot accessible through a hole somewhere on the mic. You might need to adjust the gain to match what your old one put out before it died. Note that these are typically *gain* pots for the internal amplifier for electret condenser mic; not volume controls.
Charlie


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echristley(at)att.net
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PostPosted: Mon Mar 23, 2020 3:56 pm    Post subject: Headset repair Reply with quote

I don't think those mics would work, Charlie. I'm going to try to attach a picture of what I have. I was able to use the online chat to get an email from Telex tech support. The email bounced. [img]cid:88089c2e-5fca-41e1-8fe9-150f4a7e3cfb[/img]

Sent from AT&T Yahoo Mail on Android

Quote:
On Mon, Mar 23, 2020 at 5:41 PM, Charlie England
<ceengland7(at)gmail.com> wrote:



On Mon, Mar 23, 2020 at 2:51 PM Ernest Christley <echristley(at)att.net (echristley(at)att.net)> wrote:
Quote:
I've got a pair of Telex Echelon's, and the mic has stopped working on them. Even though they're 20 years old, they are in excellent shape other than the mic.

Does anyone know where could I find replacement parts or information on how to repair the mic?


Not familiar with that particular model, but back when I was using OTE headsets, just about every company used the same 'footprint' mic. I've had good luck just hitting up one of the less-than-major headset companies for a replacement. I've even gotten one for free, IIRC. See if this link matches what you have:
https://www.ebay.com/itm/1-Vtg-ASTRCOM-10927-Aircraft-Aviation-Wire-Frame-Boom-Microphone-for-Headset/273614720674?hash=item3fb4b54ea2:g:~dkAAOSw0HlbwiXj
All the versions I've seen have a 2 pin plug on the mic cord that plugs into the mic and is then secured with 2 set screws.

I just searched for 'aviation headset replacement microphone'.

Here's a link from Pilot Mall for one that's a bit more expensive:https://www.pilotmall.com/products/pilot-usa-david-clark-h10-76-conversion-kit-pa-75-pa-5x?_pos=17&_sid=5ee04d448&_ss=r
Notice that it's identical, even though it's a replacement for a different headset.

Most (not all) have a gain adjustment trimpot accessible through a hole somewhere on the mic. You might need to adjust the gain to match what your old one put out before it died. Note that these are typically *gain* pots for the internal amplifier for electret condenser mic; not volume controls.

Charlie





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echristley(at)att.net
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PostPosted: Mon Mar 23, 2020 4:16 pm    Post subject: Headset repair Reply with quote

Busting open the mic cartridge reveals this. The tiny mic component has 55DK02 stamped on the side. With o-scope leads across the terminal, I'm not able to get any response by speaking into it.

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ceengland7(at)gmail.com
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PostPosted: Mon Mar 23, 2020 4:30 pm    Post subject: Headset repair Reply with quote

Well, that's a shame....It's been quite a while since I've bought a new muff style headset (went to Halo-s about 5 years ago, after a decade of love-hate with Lightspeeds). I've never seen the mic set up that way on any of the common makers, from a decade before to a decade after the turn of the century. Everything I've owned (multiple brands) has always used something close (or identical) to the links I sent.

Hope Telex can help.

Charlie

On 3/23/2020 6:51 PM, Ernest Christley wrote:

Quote:
I don't think those mics would work, Charlie. I'm going to try to attach a picture of what I have. I was able to use the online chat to get an email from Telex tech support. The email bounced.  



Sent from AT&T Yahoo Mail on Android

Quote:
On Mon, Mar 23, 2020 at 5:41 PM, Charlie England
<ceengland7(at)gmail.com> (ceengland7(at)gmail.com) wrote:



On Mon, Mar 23, 2020 at 2:51 PM Ernest Christley <echristley(at)att.net (echristley(at)att.net)> wrote:
Quote:
I've got a pair of Telex Echelon's, and the mic has stopped working on them.  Even though they're 20 years old, they are in excellent shape other than the mic. 

Does anyone know where could I find replacement parts or information on how to repair the mic?




Not familiar with that particular model, but back when I was using OTE headsets, just about every company used the same 'footprint' mic. I've had good luck just hitting up one of the less-than-major headset companies for a replacement. I've even gotten one for free, IIRC. See if this link matches what you have:
https://www.ebay.com/itm/1-Vtg-ASTRCOM-10927-Aircraft-Aviation-Wire-Frame-Boom-Microphone-for-Headset/273614720674?hash=item3fb4b54ea2:g:~dkAAOSw0HlbwiXj
All the versions I've seen have a 2 pin plug on the mic cord that plugs into the mic and is then secured with 2 set screws.

I just searched for 'aviation headset replacement microphone'. 

Here's a link from Pilot Mall for one that's a bit more expensive: https://www.pilotmall.com/products/pilot-usa-david-clark-h10-76-conversion-kit-pa-75-pa-5x?_pos=17&_sid=5ee04d448&_ss=r
Notice that it's identical, even though it's a replacement for a different headset.

Most (not all) have a gain adjustment trimpot accessible through a hole somewhere on the mic. You might need to adjust the gain to match what your old one put out before it died. Note that these are typically *gain* pots for the internal amplifier for electret condenser mic; not volume controls.

Charlie






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PostPosted: Mon Mar 23, 2020 4:45 pm    Post subject: Headset repair Reply with quote

On 3/23/2020 7:12 PM, Ernest Christley wrote:
Quote:
Busting open the mic cartridge reveals this. The tiny mic component
has 55DK02 stamped on the side.  With o-scope leads across the
terminal, I'm not able to get any response by speaking into it.
No image this time.


In my obviously limited experience (see the email I just sent), all the
modern headsets I've played with have electret condenser mics that
require DC power to work. Since I've never seen your configuration, I
suppose it's possible that they're using a dynamic mic. Very doubtful
it's a carbon mic, it would probably be a lot bigger.

You might want to plug the headset's mic plug into an active intercom,
and check the little connector for DC bias voltage, both with the mic
connected and without. The DC bias should be there regardless of whether
the mic is connected.

--
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https://www.avast.com/antivirus


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PostPosted: Tue Mar 24, 2020 8:48 am    Post subject: Headset repair Reply with quote

At 07:12 PM 3/23/2020, you wrote:
Quote:
Busting open the mic cartridge reveals this. The tiny mic component has 55DK02 stamped on the side. With o-scope leads across the terminal, I'm not able to get any response by speaking into it.

I'd bet that 99.999% of all microphone elements
in common service are of the 'electret' variety.
Easy to make, rugged, can be very small . . . but
this comes with a price.

Special attention needs to be paid to smooth
frequency response and minimize distortion. Qualities
of concern for 'high end' mic manufacturers (studio
quality recordings). Many high-end microphones
still exploit legacy technologies to achieve
the desired performance.

But the great unwashed, 'communications
grade' microphones will use this technology.

https://tinyurl.com/k59r249

These critters need to be biased at something
on the order of 2-4 volts. In aircraft microphones,
getting this bias is no big deal . . . aircraft
audio systems EXPECT a carbon microphone analog,
their design includes a bias network to supply
voltage to the microphone.

So your experiment to exercise the microphone
while observing output on a 'scope would
not yield useful information unless you
implement the necessary external bias
supply.


Bob . . .


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Joined: 02 Jan 2008
Posts: 61
Location: lancaster, texas

PostPosted: Sun Mar 29, 2020 9:49 am    Post subject: Headset repair Reply with quote

Don't mean to but in but I was given this web site when I was looking for a mike replacememt. Got the mike real fast. Give them a shout www.kcheadsets.com
Dick



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