GR 78

[W.A. Strong]

Need help in getting  GR 78 aligned . 

 All my attempts to set the frequency(s) are frustrating ( a very mild term) 

Problem is I cant get it  in the freq range -- Adjustment ment of the slugs and the caps in the circuits always give the same response- The frequency range is shifted as a complete move.. If I move or try to change the top end the low end will move the same way the same amount..  Is there something I am missing in that I cannot make any adjust to one end or the other .  40 meters not obtainable  the high end is 7005,  can't get 80 tuned  either . 

 Another question : Is there any decided difference in the capacity
 features of copper plates versus aluminum? 

In this receiver  3 sections,  2 have aluminum plates and one section copper.  (VFO) circuit.
  The aluminum ones are identical. The section with copper plates has  more plates than the others .  Readings of the capacity  gives me  lower  than the aluminum ones with less plates . 
 Readings are capacitor only  nothing else connected to it. 
 Bill 
 maytag at wecnet.com


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