MaheshSK wrote
This is how i bias fets i put the positive wire on pin 1 of the trimmer and negative wire to the drain pin and adjust the trimmer till i get 4.5-5 volt reading. Is this the right way Iam new to all this biasing thing..
I suspect a typo here. Pin 1 of the trimmer and the drain of the jfet are connected by a jumper, so you should not be able to get a significant voltage difference between them. They should have the same voltage unless there is a problem with the build.
When we bias jfets, we are trying to set the voltage of the drain as compared to ground. Follow Frank's biasing recipe and let us know what you find.