At 07:48 AM 3/17/2005, John L Marshall wrote: > >Google for Kronhite Filter and you will find plenty. Decades ago Kronhite >made a line of low pass, high pass and bandpass filters. None of the >Kronhites that I have seen are voltage controllable. Google Krohn-Hite and you will get the company. :-) http://www.krohn-hite.com/