[ARC5] "Using Defective Crystals" 1937

[J Mcvey]

I've heard of "gimmick capacitors", so I guess we can call this a "gimmick coil"?It's installed on top of the chassis , so it interacts with the tube., I suppose...
I've had some 1930's radios tend to oscillate if I left a tube shield off . Perhaps he is using that phenomena to enhance the crystal?  Just a W.A.G. on my part, but it probably worked.It was worth a whole $5 back in the day!


    On Sunday, June 21, 2020, 8:07:36 PM EDT, Hubert Miller <kargo_cult at msn.com> wrote:  
 
  <!--#yiv6625769213 _filtered {} _filtered {}#yiv6625769213 #yiv6625769213 p.yiv6625769213MsoNormal, #yiv6625769213 li.yiv6625769213MsoNormal, #yiv6625769213 div.yiv6625769213MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv6625769213 span.yiv6625769213EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv6625769213 .yiv6625769213MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered {}#yiv6625769213 div.yiv6625769213WordSection1 {}-->
Crystals seem to be a popular topic among radio communication hobbyists.
 
Herewith an item from ' Short Wave and Television ' magazine, Dec. 1937.
 
I have to admit, I do not understand how the added coil would work to increase
 
feedback gain. It does not appear to be coupled in any way to an output inductor.
 
( There are a number of crazy, fascinating, and instructive kinks hiding in the old
 
magazines. ) 
 
-Hue Miller
 
  
 

 ______________________________________________________________
ARC5 mailing list
Home: http://mailman.qth.net/mailman/listinfo/arc5
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:ARC5 at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: https://www.qsl.net/donate.html  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200622/383d0ff6/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image003.jpg
Type: image/jpeg
Size: 68730 bytes
Desc: not available
URL: <http://mailman.qth.net/pipermail/arc5/attachments/20200622/383d0ff6/attachment-0001.jpg>