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

[JAMES FALLS]

Now I want to dig out my BC-375 Manual..... 

Jim Falls K6FWT 

> On Apr 2, 2020, at 16:13, hwhall at compuserve.com wrote:
> 
> 
> 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.
> 
> Wayne
> WB4OGM
> 
> -----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
> 
> Wayne
> WB4OGM
> 
> -----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
> 
> 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 W7SVJ
> 5111 E. Sharon Dr.
> Scottsdale, AZ 85254-3636
> H (602) 953-5779
> C (480) 550-2358
> scottjohnson1 at cox.net
> scott.johnson at 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:
> <image001.jpg>
>  
> 
> Virus-free. www.avast.com
>  
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