I breadboarded a circuit a while back based on Harry Lythall's (SM0VPO) website.(
http://web.telia.com/~u85920178/use/stereo.htm).
As I remember, it worked ok, but signals on the edge of the filter skirts produced annoying sounds. I was going to put it in my HW-8. It is now on the "gotta get to that" shelf.
As I am almost finished with my K1-4 (2 transformer windings + alignment), I might play withit again. The concept seems solid with the proper tweaking. Perhaps if I replace the opamps with 12AX7s ;). (Sorry- couldn't help myself!)
Hope this helps-
Pete
K1 #2194 (almost done)
Pete Axson
WD4LST
17901 NE 18th Ave
Citra, FL 32113
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