[R-390] R-390A IF Module Layout

[Bill Kirkland]

I have one sp-600 with all ceramic disks.  One.

I pulled the data sheets for the caps I use, both ceramic and film, and 
check the resonant frequency performance of the caps.  From a data sheet 
point of view (reactance v freq) I didn't see much of a difference.

(do watch the ceramic material type though. I don't use Z5U).


bill



>  Interesting that Hammarlund early on in SP-600 production adopted an 
>engineering change that substituted disc ceramics for the tubular paper 
>caps for this very reason, then apparently went right on making radios with 
>the paper caps.  SP-600s with factory-installed ceramic bypass caps are few 
>and far between -- I've only seen one, out of the hundreds I've examined.
>