[ICOM] Icom 756PRO Noise Blanker help

[Phil Krichbaum]

Some of the 756PROs had a TX birdie about 10 KHz above the dial freq on 
6m! Others were OK?
    Phil N0KE

John Geiger wrote:
> I recently purchased a used Icom 756PRO which is a very nice radio, but it
> has something unusual about it.  When I turn on the NB, it makes a noise
> like a howling wind or kind of a screetching sound.  That is about the only
> way I can describe it.  It only does this on SSB, not on the other modes.
> I hear it with my headphones on,and also thru the speaker.  It is
> background noise dependent as it disappears if I turn off the preamp.
>
> Have you heard of anything like this, or know what it might be?
> 73 John AF5CC
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