I noticed the same thing in a Spectra I purchased used late last year. This particular radio looks to have not be cap modified, but I noticed the missing cap easily.
Roger W5RD >Another thing worth noting is that in the three 900 MHz Spectras >that I've >recapped, the 47uF cap on the RF board was not present. >It was present on >all of the 800 MHz and 450 MHz Spectras that >I've worked on. > >Thanks again to Bob for his article, and I hope that this posting >might help someone else. > >73/GL > >Steve N8NM Roger White Murphy, Texas