Re: Assisted Listening systems.

>To a first order appoximation a simple band limited differentiator will get
>you at least much closer to workable with that old quad (Funny how everyone
>who has had to hack a quick bodge on this uses a 405....). 
>I didn't find the 405 to be that bad from an RF pickup perspective, but the
>few ohms of series resistance and a few carefully placed caps probably had
>something to do with that.
>
>The steel thing takes a little more work (cheap parametric), and some fairly
>serious compression/limiting really helps. 

If, for whatever reason, you have to implement one, you will do whatever your
engineering skills and talents tell you needs to be done. I should.

But, it would not stop me from giving strong advice against it. 

The Quad 405 is popular because it has a very versatile output transformer. All
the windings in parallel, 2 ohms: all the windings in series, 100V line. Take
your pick.
Frank Wood
[EMAIL PROTECTED]