Can anyone help with this HQ-170 variation? mod?

[Kenneth D. Grimm, K4XL]

> This fellow needs some help in identifying what he has.  Does anyone
> recognize what he is describing?  The Hammarlund Historian's web page
> seems to have disappeared and I can't find anything in any of my files
> on this thing.  Sounds like it might be a noise blanker accessory, but
I
> can't recall whether there was such a thing available for the HQ-170A.

Thanks to everyone who replied.  The device is the IF noise silencer
accessory for the HQ-170 and HQ-180 series receivers as I suspected.
Special thanks to Rob Dunn, KD7HRN, the complete manual in pdf format is
now available for download on BAMA.

73,
 Ken K4XL
k4xl at arrl.net
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