[Elecraft] K3 Hardware Upgrades

[Don Rasmussen]

I did upgrades today for early K3 #272. 

I considered these necessary:
12v sense PA
REMIO UPGD RS232 isolation
and AFOPMDKT speaker short circuit protection.

I also ordered a new top cover to match the beautiful textured
top cover Elecraft is sending with new K3s. The sides and bottom
seem the same, already textured. And for some odd reason the side
panels are even more expensive than the top. ??? 

I did -not- apply the AF Stage upgrade for LINE OUT and speaker 
can anyone suggest that there is a perceptable difference to be heard with this?