[NJARC] RadioShack "Express Stores" to Open in HobbyTown USA

Sat Jul 21 18:54:41 EDT 2018

Just found the news and "was" going to post it to the Digest but Joe 
already did us the favor. I did find one NJ store. One can only hope 
that with time there will be more stores, (who cares who hosts them) and 
RS products that we can actually use would be stocked. HobbyTown USA - 
Byram Plaza Shopping Center in Stanhope, New Jersey

The NY Post article:
https://nypost.com/2018/07/13/radioshacks-comeback-is-taking-shape/

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> Today's Topics:
> 
>    1. A little radio theory question ... (Al Schapira)
>    2. Fw:  A little radio theory question ... (Jim Whartenby)
>    3. Open audios in 20s vintage sets. (Robert Lozier)
>    4. RadioShack "Express Stores" to Open in HobbyTown USA
>       Locations (TrainBee)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Fri, 20 Jul 2018 12:49:59 -0400
> From: Al Schapira <w2ads at verizon.net>
> To: Al Klase <ark at ar88.net>, njarc at mailman.qth.net
> Subject: [NJARC] A little radio theory question ...
> Message-ID: <1532105399.7992.8.camel at verizon.net>
> Content-Type: text/plain; charset="utf-8"
> 
> .. concerning interstage audio transformers in TRF sets.
> 
> Say you have a UX-200 detector stage transformer coupled to the
> following UX-201A stage.
> Typically, the transformer ratio is 1:3 or 1:4 (primary:secondary) for
> an impedance ratio step up of 9 or 16 to one.
> 
> Now, the plate resistance spec for the UX-200 is 30k and the UX-201A
> grid is otherwise open and the 201 is usually biased at -4.5 volts.  So
> 1) How critical is the turns ratio?
> 2) How critical are DC resistances in the primary and in the secondary?
> 3) What are typical values for the DC resistances in the primary and
> secondary windings?
> 
> You guessed it.  I have three TRF sets with open transformers. Anyone
> have any to spare?
> 
> Thanks.
> 
> 	-Al, W2ADS
> 	www.gamma-five.com
> 
> 
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> ------------------------------
> 
> Message: 2
> Date: Fri, 20 Jul 2018 20:40:11 +0000 (UTC)
> From: Jim Whartenby <antqradio at sbcglobal.net>
> To: "njarc at mailman.qth.net" <njarc at mailman.qth.net>
> Subject: [NJARC] Fw:  A little radio theory question ...
> Message-ID: <2020885314.11593.1532119211292 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
> 
> Al
> 
> 
> I had a Majestic console that had a open interstage transformer. ?I used a small power transformer as a replacement that was rated 117 volt primary to about 375 to 425 volt secondary. ?Worked like a champ. ?In looking at some industrial 120 volt primary to 24 volt secondary transformers with welded E & I laminations; I found that they were not as good for audio. ?If you have an audio oscillator and o'scope, you can do a quick check to see what you might have around that will work.Good luck,Jim?I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?
> 
>       From: Al Schapira <w2ads at verizon.net>
>  To: Al Klase <ark at ar88.net>; njarc at mailman.qth.net 
>  Sent: Friday, July 20, 2018 11:52 AM
>  Subject: [NJARC] A little radio theory question ...
>   
> .. concerning interstage audio transformers in TRF sets.
> Say you have a UX-200 detector stage transformer coupled to the following UX-201A stage.Typically, the transformer ratio is 1:3 or 1:4 (primary:secondary) for an impedance ratio step up of 9 or 16 to one.
> Now, the plate resistance spec for the UX-200 is 30k and the UX-201A grid is otherwise open and the 201 is usually biased at -4.5 volts. So1) How critical is the turns ratio?2) How critical are DC resistances in the primary and in the secondary?3) What are typical values for the DC resistances in the primary and secondary windings?
> You guessed it. I have three TRF sets with open transformers. Anyone have any to spare?
> Thanks.
>  -Al, W2ADS www.gamma-five.com
> 
> Just remember
> Reply = Poster
> Reply All = Everyone
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> ------------------------------
> 
> Message: 3
> Date: Fri, 20 Jul 2018 17:35:47 -0400
> From: Robert Lozier <kd4hsh at carolina.rr.com>
> To: NJARC at mailman.qth.net
> Subject: [NJARC] Open audios in 20s vintage sets.
> Message-ID: <7630052d-9555-22c0-c2cd-6ba858df0a50 at carolina.rr.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Check out this ARF thread I started a few weeks ago... At the bottom of 
> this page it gets into showing a SS replacement for open audios that has 
> worked just dandy on two sets and I'm ready to install and test in 
> another...(been saying that for three days but something always comes up 
> to hijack my fun time)...
> 
> http://www.antiqueradios.com/forums/viewtopic.php?f=6&t=341663
> 
> Robert
> 