[Elecraft] K3 AF Upgrade Kit - alternative RF choke

[Dave G4AON]

With the Elecraft upgrade kit shipped to the UK costing over $20 for a
100 uH choke and two surface mount resistors (yes I know there are 4 in
the kit and two axial ones), I wound a choke and used two surface mount
resistors from my spares/repair kit. For anyone who is struggling to
justify buying a slim RF choke to fit between the K3 RF board and the
cover plate (needs to be no thicker than 0.275"), I made a 100 uH choke
using 15 turns of enamelled copper wire on a FT50-43 core and covered it
with clear heatshrink. I cannot really say the audio sounds any better
on my bookshelf speakers after changing the choke, but at least it
didn't cost much...

73 Dave, G4AON
K3/100 #80