Model: IC-751 Bulletin: B1706 Subject: Some 751As exhibit a slight chirp on CW when operating in SPLIT mode. Information: This modification speeds up the transmitter "start time" circuit on the main board 1. Remove the top cover from the radio. 2. Remove R32 (currently 180K) and replace it with a 82K 1/8 watt resistor (ICOM P/N 915-01123). 3. Replace the cover and return the radio to service.