Orange Sqiusher

[IGR]

I´m seeking for insider. My local supplier offers closest JFET type BF245A, it has very wide Vp, opposite 2N5457 which Vp should be: average-1.58V (spanning from -1.22 to -1.80). It´s decisive value in OS circuit? Otherwise, properly picked BF245A should be right substituted? Thanks for any reply.

[Mark Hammer]

Variations in FETs is why the OS has that trimpot.  I think you should be fine with BF245.  Maybe not "perfect", but fine.

[IGR]

Thanks Mark, for your replies, if compression ratio would be guidable by this 10K trimpot, no depend on JFET type, I´ll be happy.