JFET Forward Bias

[1handyandy]

Hello all,  I'm a new member and am looking to gain some knowledge from the excellent folks here.  I'm in the midst of building a mini-booster type knockoff, based off the National semi-conductor AN-32 document.  http://www.national.com/an/AN/AN-32.pdf  (Page 6, Ultra-High Gain Audio Amplifier).  I had a question about the biasing of of the upper JFET which is clearly forward-biased, sitting around 4.5V (assuming a 9v input).  Current would be very minimal due to the large 10M divider network, but everything I've ever learned about JFET's is to NEVER forward bias them.  Can someone explain what's going on in this circuit?

Thanks!

[merlinb]

It's not forward biased. The source voltage will rise to some value above the gate voltage, where the FET is suitably biased.

[1handyandy]

Aha, thank you for pointing that out!  I should have recognized that... clearly a case of the mondays.  What a fantastic forum, though.  First post, and I got the answer I needed in just a few minutes