Hi Folks. Just a little update, all well so far. Had it on receive and it seems fine. txtd on CW into a load and got 1.53 amps.
My problem started by twiddling were I shouldnt have. the Rig had run fine even post twiddle, but once the 4.7k broke of the connector then the 510 blew.
What a great education you guys provided me with on this thread, Raj, Jerry and Marco, thank you for patiently and methodically guiding me through taking a blown 510 to getting my rig back up and running.