[R-390] service of an R-725

[wb3fau55 at neo.rr.com]

390A gurus-  a number of questions concerning the R-725.  So straighten me on a number of points with  this item.  A 725 is a modified 390A,  not using mech. filters,  for whatever reason?  
 I may get one of these for repair.  The problem- no receive below 8mc.  Fairly common problem in the 390A,  in the 1st xtal osc.  So my main question is-  any difference in the RF deck of a 725 vs. a 390A?
 As alaways, thanks for your input-73s Russ.