[ICOM] How do the Receivers and DSP compare between the 7600, 7700, and 7800?

[Larry Young]

Roger; The 7700 and 7800 have preselectors in the front end and built in power supplies.. Their transmitters are 200 watts. The 7600 has no preselector and because of this, also has dual watch like your 756Pro. It has a 100 watt transmitter. All have similar  processors and dsp.The bandscope on the 7600, while not as good as the 7700/7800 is better than the pro series.
AB4OJ's web site can provide all the details.
Larry K4LXV