Dan, U.S. Air Force, retired wrote:
I need a replacement or substitute for 2N6849, any suggestions?
I have tried Dgi-Key, Mouser etc but it doesn't show up on their cross
reference lists.

Dan, U.S. Air Force, retired

It's just a P-channel FET why not try a general replacement?
the 2N5460 comes to mind but I'm not sure about the pin out.
73
Richard WB8KRN