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Testing and comparing the two radios on SW, SW-SSB, LW and MW.
Antennas: 5m wire for SW, internal for LW/MW.
The Tecsun is like an imaginary updated version of the 7600GR: same size, same features, with better ergonomics and a better display. It can even automatically switch on/off a Sony AN-LP1 antenna connected to the ext. ant. input, just like the 7600GR does.
The performance is similar. Sony is better on LW and MW. On SW the Tecsun is a little bit more sensitive and has a better sync. The overall sound quality is better on the 660 (excepting for the muting of weak signals, which I personally hate it).