GM List, Wrote: But I understand that there is a better mod There are two: Cheaper and Simpler Upgrades for the R-390A HF Receiver is found in Chapter 11 of the Y2K-R3 manual. The other is by Bill Kleronomos KD0HG. This excellent sounding mod requires an extensive modification of the AF deck as well as a new output transformer. Regards, Perrier