[Elecraft] Spurious tone on K2

[Kenneth Moorman]

I have K2 #4456 that is generating a tone starting at 14360.66 kHz and ending at 14365.65 kHz.  The tone is adjustable by both AF and RF gain controls, is not a function of which antenna is selected, or any antenna connected.  It is steady in amplitude at 30 db over S9, and gradually rises in pitch as the receiver is tuned through the range stated, starting about 800 Hz to probably over 1 kHz.

The K2 is equipped as follows:

KSB2, KNB2, KAT2, K160RX, and KAF2.

Does anyone know what this is?  I have not closely re-read the manual, but I don't remember anything about this sort of spurious output over such a range of frequencies.  The unit seems to be operating just fine in all other respects.  Any thoughts will be appreciated.

72/73,

Ken, NU4I