[CW] Bencher XZ-2 Audio Filter

[Donald Chester]

I just found one of these in a box of scrapped radio junk someone gave  to 
me instead of tossing out.   I built a power supply for it after making some 
minor repairs and it appars to work ok.  It effectively suppresses the 
filter blow-by in my 75A4, reduces  background hiss with the narrow filter, 
and even makes my Kenwood R-1000 reasonalbly satisfactory for copying cw.  I 
think it will be a useful addition to my shack.  One drawback is that the 
pure sinewave tone that comes out of the filter causes listener fatigue 
after a while, even though it helps pull weak signals out of the noise.

Just wondering if anyone here has had any experience using this unit,  Would 
also like to know the input and output impedances.  I have experimentally 
determined that it has a high-Z input and a low-Z output with enough power 
to drive a small speaker.  I would  like to have a copy of the manual and 
schematic if anyone has one along with access to a xerox machine.

73,
Don K4KYV





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