Since solder is such a poor conductor, why use it?

Timrhu, yes solder is awful now. It cracks.

Tbg

Sure solder joints crack if not done properly. But they also will out live us if done correctly.

if you are not happy with solder then you could always try conductive epoxy! Drying time might be the only issue :)

For me, silver solder is fine and it seals against oxidization, just ensure that the pieces being soldered have a good connection and try not to use too much solder. Also, using a good flux paste ensures good eutectic flow :)

Electron tubes are not soldered into place. All those ribbon connectors are not soldered. Why not use tiny little mechanical connectors instead of solder? Has anyone actually measured the losses due to all the solder connections? One wonders how much it could be and compared to what.

Wire wrap connections...

Almarg, I doubt seriously if the solder you and I have access to is anything like that used in the military.

Mapman, a linear amp doesn't solve the problem but could afford the welding of wires.