[Heathkit] RE: HR-10B, CWF-2 Audio Filter

[Tom NØJMY - AAR7FV]

Yep.  The 820K has a parts placement overlay that the CWF didn't have, 
too.  At least the CWF's that I've had didn't have it, I assume because 
they were factory built.  Ads from the early 70's indicated that the 
CWF-2 had three different available center frequencies.  I can't 
remember what they were, but it was along the lines of 700 Hz. 
(standard) or, optionally, either 400 Hz. or 1000 Hz. maybe?  I've never 
encountered the optional ones in any of the half dozen or so that I've 
had.  I usually end up taking them out of their cabinets and installing 
them behind the detector in HW-16's. 

BTW, I think Vectronics is *owned* by MFJ isn't it?

Ted Bruce wrote:
> The Vectronics 820K Active Audio Filter is identical
> to the CWF-2.  I bought a CWF-2 back in 1972, and
> recently re-installed an 820K for a friend.  The
> 820K's polystyrene caps are slightly smaller in
> physical size from the '72 vintage, but otherwise it's
> the same.  The 820k circuit board still has "CWF-2" on
> the bottom.
>
> 73,
> Ted KX4OM
>
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