단구 (12AU7) 라디오

 

 

http://www.vk6fh.com/vk6fh/12au7regen.htm

 

 

 

 

 

 

 

 

Ref 1: http://www.members.iinet.net.au/~cool386/kits/ace.htmll 

Ref 2: http://www.youtube.com/watch?v=orSlJ9oJ3d0&feature=related

Ref 3: http://www.youtube.com/watch?v=9O6qUY7X4VA

 

 

 

 
 

 

Original circuit of the Radio Ace. I thought some of the component values were a bit strange even before I tried out the set. My suspicions were correct.

 

 

 

 

 
Redesigned circuit. Modifications were: - R3 to 1M, R2 to 100K, R1 to 2.2M, Ant.1 direct to C1/R1/C4 junction, Ant.2 to Ant.1 via 33pF, and Ant.3 to Ant.2 via 12pF.

 

(eom)