Antique-style crystal radio kit. 
Heathkit may be out of business but you can still get old and old-style crystal radio kits from www.xtalman.com.  I put this one together with my six-year-old: Can you tell?  Crystal radios use germanium diodes because they have a lower voltage drop than silicon, and are therefore more sensitive to weak radio signals. 
Source: Borden Radio Company 
Contributor: Theodore Gray 
Acquired: 18 April, 2003 
Text Updated: 11 August, 2007 
Price: $16.50 
Size: 6" 
Purity: 99.99%
 |  
  |  
 |  
  |