[ARC5] Make that Old T-17 Work with BC-456

[hwhall at compuserve.com]

I've only done a couple T-17s so far. One, I replaced the carbon with granules from a decently working 1960-70s era T-100 telephone element.  The other, I replaced the element with a smaller carbon telephone element often used in the old operator's headsets. It think it's designated an N-1 element.  The capacitors I did have to replace with something newer looking. The style they'd used wouldn't allow for restuffing.  Granted, they aren't original either, technically, but they sound like original.
WayneWB4OGM

-----Original Message-----
From: J Mcvey <ac2eu at yahoo.com>
To: arc5 <arc5 at mailman.qth.net>; hwhall <hwhall at compuserve.com>
Sent: Thu, Apr 2, 2020 4:02 pm
Subject: Re: [ARC5] Make that Old T-17 Work with BC-456

 It's not original -true, but GOOD LUCK finding a GOOD T-17 . 
If you use the radio, the mike has to be able to modulate the carrier better than 10%, IMO.The original resistance of a T-17 was around 50 ohms. I am yet to find one that measured that low. 
Some of the "better" ones might measure several hundred ohms which still doesn't make the cut.
Also, what do you do when the caps are bad? Where do you find GOOD flower pot caps? 
I cut mine open and re-stuff them so at least they look like the original as does the mike!

As far a sound goes, I suppose baffling could be constructed to alter the characteristics so that the  electret may sound as bad as a carbon. 

    On Thursday, April 2, 2020, 6:15:56 PM EDT, <hwhall at compuserve.com> wrote:  
 
 If it's sounding all so fine and mellow.... it ain't a T-17 anymore. Just 3D print a fake-a-roo and leave the old hardware intact.  A T-17 with electret guts seems like those 'tombstone' radios with the cassette player stuck in the side.  Abomination.  :-D
WayneWB4OGM

-----Original Message-----
From: Scott Johnson <scottjohnson1 at cox.net>
To: 'David Stinson' <arc5 at ix.netcom.com>; 'ARC-5' <arc5 at mailman.qth.net>
Sent: Thu, Apr 2, 2020 11:06 am
Subject: Re: [ARC5] Make that Old T-17 Work with BC-456

#yiv2390923264 -- filtered {}#yiv2390923264 filtered {}#yiv2390923264 p.yiv2390923264MsoNormal, #yiv2390923264 li.yiv2390923264MsoNormal, #yiv2390923264 div.yiv2390923264MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:sans-serif;}#yiv2390923264 a:link, #yiv2390923264 span.yiv2390923264MsoHyperlink {color:blue;text-decoration:underline;}#yiv2390923264 .yiv2390923264MsoChpDefault {font-size:10.0pt;}#yiv2390923264 filtered {}#yiv2390923264 div.yiv2390923264WordSection1 {}#yiv2390923264 Why not just install a 50 cent electret cartridge in the T-17, and call it a day?  (you’ll have the finest sounding T-17 around!)  Scott V. Johnson W7SVJ5111 E. Sharon Dr.Scottsdale, AZ 85254-3636H (602) 953-5779C (480) 550-2358scottjohnson1 at cox.netscott.johnson@ieee.org  From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of David Stinson
Sent: Thursday, April 2, 2020 11:00 AM
To: ARC-5 <arc5 at mailman.qth.net>
Subject: [ARC5] Make that Old T-17 Work with BC-456  Got a BC-456 modulator you want to use, but only "dud" T-17 mikes?  Yes; in a perfect world, we'd wait and search until we found a "good" T-17.   This world ain't perfect.  I don't know about you, but the sand in my hour glass is getting a little low, and given the current world situation,  I'd kinda like to enjoy my gear before "Ol' Grim" comes to collect me.  

So if you're T-17 will so even 10% mod, here's a non-destructive way to change two resistors and get your BC-456 modulator singing for you:  
|  | Virus-free. www.avast.com  |

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