Model: IC-751 Bulletin: B1705 Subject: Improvement of transmitter intermodulation distortion figure in the 18 MHz band 1. Remove the covers from the radio. 2. Replace the following parts on the indicated boards. Current New ICOM Designator Part Board Part P/N C27 10pf Filter Board 12pf 500V 918-01516 C29 47pf Filter Board 12pf 500V 918-01516 Q4 PA Section 2SC2904 906-00434 Q5 PA Section 2SC2904 906-00434 3. Readajust and verify the PA idle current (set to 100 ma) and PA drive current (set to 600 ma) are correct. 4. Replace covers and check all functions.