Smith charts https://en.m.wikipedia.org/wiki/Smith_chart https://en.m.wikipedia.org/wiki/Smith_chart You can put an amp 50ohm output into a 75 ohm cable or co

Smith charts https://en.m.wikipedia.org/wiki/Smith_chart https://en.m.wikipedia.org/wiki/Smith_chart You can put an amp 50ohm output into a 75 ohm cable or connectors but there will be negatives. The further away from output impedance the more negatives. Loss, distortion, and worse roll off, etc. Cables are fun too. for much higher frequencies, the less of the actual copper is used. The signal uses the surface of the wiring. For lower frequencies it uses the entire strand/solid copper wire. RF mostly uses 50ohm but not always. Cable video (tv) is usually 75ohm.