[ARC5] T-17 Microphone

[Mike Feher]

Mark -

While the mount is rusty enough to be WWII vintage, the transformer looks
like a modern Japanese unit. Are you sure that is a T-17? 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 


-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Wednesday, June 11, 2014 5:56 PM
To: jeepp at comcast.net
Cc: ARC5
Subject: Re: [ARC5] T-17 Microphone

Here's 2 photos the the matching transformer.

www.k3msb.com/temp/T17_1.jpg
www.k3msb.com/temp/T17_2.jpg

It looked original form the way it was wrapped etc, but I've not seen the
guts of a T-17 before.

73 Mark K3MSB


On Wed, Jun 11, 2014 at 11:58 AM, D. Platt <jeepp at comcast.net> wrote:

> Mark,
> I'll second what Dave said.  The element might well be usable but time 
> will tell after all else is done.  The capacitor is supposed to bypass 
> higher frequency noise as from dynamotors and inverters such in an 
> aircraft and ground installations.  I believe its a .005ufd, but that
seems small,
> given the low Z of the mic.  I'll have to check...?   I often use
> 3-conductor power cords, those with no drain wire and that are flexible.
>  Many older HP cords are rubber and not the stiffer plastic and look 
> original.  If the mic element is shot, one from either an H-33/PT 
> handset or an old telephone/PBX headset will do very well.  Those PBX 
> elements are small but also difficult to find.  I agree with the
transformer comment...
> What transformer???  Should not be one there.....  The lugs and clamp 
> from the PL-68 can be removed, cleaned up, and re-used.  Using a T-1 
> element, and such, from telephones makes the mic, as I've said before, 
> looks like a pig wearing a gas mask.  Be sure and burnish the contacts 
> on the SW-106, too.
>
> Jeep - K3HVG
>
>
> On 6/11/2014 9:43 AM, David Stinson wrote:
>
>>
>> ----- Original Message ----- From: "Mark K3MSB" 
>> <mark.k3msb at gmail.com>
>> Subject: [ARC5] T-17 Microphone
>>
>>
>>  First, can the carbon mic element be salvaged?
>>>
>> Not really.  I like "originallity," but draw the line at microphones.
>> If the radio is going to be alive, a "stock" T-17 isn't going to work.
>>  Not unless you're made of money
>> and can by dozens to find one that will give you about 50% mod.
>> A microphone element from an old land-line telephone will work.  
>> Unfortunately, it won't fit inside a T-17 case unless you're willing 
>> to mill-out the mounting space.
>> It's not a perfect world.  I won't tell if you don't.
>>
>> "Matching transformer??"  Shouldn't be one inside a T-17.  The cap is 
>> to help kill the audio "highs" you don't need.  Don't remember the 
>> value but I'll bet someone here does.
>>
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