Mark wrote this recently:
Just a quick update, I've been running the 7600gr and the PLL-660 side by side for a few days (and nights) and everything I hear on one, I hear on the other. Intelligibility-wise, no appreciable difference. I have yet to do much with the memories on the 660, except to notice that while I was able to enter AM freqs in page 0, entering SSB freqs pops me into page 1 (Being able to save the SSB state in a memory is a definite plus). I need to experiment with this a bit, and I'd love to hear from users more familiar with this aspect of the radio.
So far, receiver-wise, I can't say one is better than the other. They're both great. Ergonomically… to soon to tell. I've been using the 7600gr since it first came out and the 7600g for many years before that, so I'm just really used to the way it works.
One thing, the detent on the 660's fine tuning was a very bad idea.

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