The receive on my FS 2340 occasionally drops down about one s unit. This happens whether the transceiver is cold or hot. It immediately comes back up when I quickly key and un key the microphone. I don't recall which one of these crystals is what I believe to be a receive mixing Crystal. I have a NOS Y1 position crystal. Although I believe the Y1 to be the recive mixing crystal I'm not 100% sure. Is there anybody out there that knows if the Y1 is indeed the received mixing Crystal? If the Y1 position it is indeed the receive mixing Crystal I will drop in the nos one I've got. It can't hurt considering I have absolutely no clue as to why the receive is acting as I mentioned.. I will also make sure the tubes are seated properly I will also remove and clean the contacts on the relay. Unfortunately I don't have a tube tester and although I suspect it might be a failing tube besides replacing each tube pertaining to the recive section one at a time looking for the possible culprit I'm out of options. My second guess is that a failing tube would not cause the receive to immediately come back up to its normal s unit reading of the station, once I tap on the mics key bar but I'm obviously guessing. This is happening often enough for it to need repairing. If you have any other ideas as to what might be causing this problem I would appreciate your input. 73 PS my knowledge is very limited. My goal is to not have to pack and ship it for a problem I might be able to rectify with someone's help. I'm fairly positive my tech will actually charge me less than the shipping cost to track down and fix the problem. I'm guessing it's not a major malfunction. Shipping always makes me nervous. I always imagine some UPS shipper kicking my parcel down a flight of steps and or throwing it into his or her truck.