Re: Input to JFET + 1M pull down +1M gate to ground +18v= SQUEAL

Posted by IvIark on Aug 04, 2014; 3:03pm
URL: http://guitar-fx-layouts.238.s1.nabble.com/Input-to-JFET-1M-pull-down-1M-gate-to-ground-18v-SQUEAL-tp12055p12077.html

It shouldn't really matter.  Well it does but you can make allowances for it when testing new resistors in that position so why bother changing two when you only have to change one.   If the input impedance is 500K with the two 1M resistors then you can still get anywhere from 1 to 500K by just changing that gate resistor.

Because it's in parallel though, the pulldown resistor does set the maximum impedance of the circuit, so if you want to increase impedance you are going to have to increase the pulldown too.