[Elecraft] K1 Audio Problem after fitting KNB1 Noise Blanker

[Mike Morrow]

Ray wrote:

> The "whine" is a steady continuous tone (perhaps at 800 or 900 cycles), not
> popping, nor a low pitched oscillation and in fact I wondered if the
> sidetone spot was on or if the key was down.

Have you checked that the small slide switch S2 for for the OFFSET TEST adjustment
(on bottom of the RF board) didn't get inadvertently placed in the TEST position
rather than the OPER position?

I'd check that before anything else.

73,
Mike / KK5F