Garey: Thanks for the reply. The issue is on receive and no I don't use 40 very much and I guess this issue might be one of the reasons and the other is the band has not been to good until just lately. The audio is annoying to say the least. I have not had any audio reports that would indicate the same issue on Transmit. I will ask the next time I am on 40. I use an inverted vee antenna at 30 feet going through a MN-200 tuner on 40 . The antenna is cut for 3.972 MHz and I go direct through the tuner on 75 meters .No matching required for that segment of the band.The audio is ok on 75 meters but the vibration on the top of the speaker cabinet is always there whether the audio gain is up or down. I did hear that there was a new circuit board and caps available for the power supply and that it is recommended to do the upgrade with these new parts and circuit board. Not sure if that was done when the supply was rebuilt. I did get a bag of old parts returned to me when the rig was repaired. A couple of caps and a few resistors plus some tubes from the transmitter. Do you sense any vibration when your power supply is running with both receiver and transmitter turned on in the receive mode? Thanks Fred WD8ADG
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