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The Kenwood TS-940S/AT was manufactured at and after 1986. At the time Kenwood considered it their top of the line competition class HF radio until it was later surpassed by their newer model TS950DX. The Kenwood TS-940S/AT was manufactured at and after 1985. At the time Kenwood considered it their top of the line competition class HF radio until it was later surpassed by their newer model TS950DX. Based on which production run the radio is from may determine what problems you will have. If you can power it up then down again and the S-meter slams to the right, it's the first production run and may have a number more problems than later runs where factory assembly defects were corrected. Based on the serial number you can tell the year of manufacture. It is the first digit of the SN that is the year of manufacture. If the SN is 5xxxxx then it was made in 1985.