[ARC5] T-17 Metal 1942 or Plastic 1944 for 1949 GRC-9?

[hwhall at compuserve.com]

Since you know now how to open up the granules cup, you might try cannibalizing a phone element for its granules and try swapping them. I've heard of at least one person that replaced old carbon mike granules that way with some success. I know there was an old WE (I think) advertisment showing they refurbished elements with new carbon.
 

 Wayne
WB4OGM

 

-----Original Message-----
From: Richard Knoppow <1oldlens1 at ix.netcom.com>
To: hwhall <hwhall at compuserve.com>; arc5 <arc5 at mailman.qth.net>
Sent: Thu, Sep 15, 2016 9:19 pm
Subject: Re: [ARC5] T-17 Metal 1942 or Plastic 1944 for 1949 GRC-9?

That is possible. I used a -hp- digital meter, it probably has 
pretty low current on the ohms range. I will try it again with a Triplet 
630A should put more current through the mic. I can also try it with a 
couple of flashlight batteries.  It never worked very well. I would not 
have tried opening it if it had.

On 9/15/2016 7:35 PM, hwhall at compuserve.com wrote:
>> Mine reads very high resistance, about 12K where a good carbon element
>>should read perhaps a couple of hundred ohms.
>
> I think I recall that Dave discovered, on a useable T-17 button, that
> the ohmmeter measured resistance varied a lot depending on the meter
> used. His theory was that the newer meters passed less current thru the
> carbon than older analog meters and since the carbon is not a fixed
> resistance, it varied with the applied current.
>
> Wayne
> WB4OGM

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL

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