breadboard wierdness??

[snoof]

so I'm trying to breadboard some generic FET(201 in this case) stages to play around w/ some ideas, and I get the bias set (roughly 4.5v ish) and then I take a break for a few minutes, when I come back, i measure 9.4v bias??  Strange.  So i must have done something wrong somewhere.  go over it again, all loooks good.  Remove everything but one single FET stage.  Set the bias again, leave the meter hooked up, all looks good.  turn around for a minute, turn back, bias is back to 9.4v???  What gives here!  I switched to diff spots on the breadboard, used diff spots on the 9v rail, everything I can think of.  Used diff pots, resistors, FET's...  Is there something I'm missing??  This happens whether it's hooked to an amp or not.  There are both in and out caps installed, as well as 1M to ground resistor on the input.  I do see the bias shift a few volts when I remove the 1M to grnd.  I don't remember running into these probs in the past while using my breadboard.  Anyone had strange probs like this on their breadboard??  Am i loosing my marbles here

[DougH]

You have a loose connection somewhere. Whenever you look away it is loosening up...

[snoof]

so since i'm getting voltage on the drain(so no loose conn there, or there'd be no voltage), the culprit would have to be in the source area??

[DougH]

I would guess it's in the source circuit somewhere. Maybe it's not staying grounded.