[37silverstreak]

I've been working on a 1936 Fairbanks Morse 72C2. I've done a complete recap as well as replacing all of the resisitors and some bad wires. I've also aligned the set and overall it's playing very well. the exception is when I reach the 800 to 900 Khz area. in this area the radio starts to motorboat loudly and the tuning eye pulses in brightness. Once I pass either side of this band the radio works normally again. It only does this on the broadcast band. Police and shortwave are unaffected. If I place my finger on the grid cap of the RF tube (6K7) the motorboating goes away and I can pull in a station in that area. Once I take my finger away the problem returns. I've tried switching tubes with no luck, anybody have any ideas? Thanks!
Kevin