A lovely Saturday puzzle. Took us just about an hour, which, for us, is a good Saturday time. Good in that it is not too fast or too slow. And it was satisfying. Sure, there's an RST and an IERE here and a NOLOS there, but come on, there's tons of fantastic material, too. So let's get started, shall we?
My favorite of the ten-letter answers has to be PHONEBOOTH (28D: DC transformation location). That is a fantastic clue. As Frannie put it, first she thought of Washington, then she thought of a power source. And speaking of power sources, I also enjoyed SOLARARRAY (29D: Collection of green panels) even though the clue was positively pedestrian compared to the previous one. And BATTERYBOX (14D: Its contents provide juice) up in the NE, was pretty weak. The other two up there, LOOKATTHAT (12D: Head-turning cry) and ARRIVELATE (13D: Make a fashionable entrance?) (What about that question mark? I think it makes sense.) were both good.
As for smaller stuff, I loved OOMPH (25D: Juice) for the word that it is, and for its call-back to 14D. And speaking of "call-backs," the 11A: Sing (BLAB)/69A: Sings (NAMESNAMES) pair was quite good. Especially the latter. It was down in the SE that we ended (this morning, after putting it down unfinished last night). BROODMARES (63A: Important stud farm visitors) and ITALIANART (67A: Pre-Raphaelite ideal) just would not come. It didn't help that I had put in "males" at the end of the stud-farm clue, thinking that it might be right. It's funny that "male" and "mare" are just one letter off.
You know, I just looked up Pre-Raphaelite art, and I now think it is a good contender for worst entry in the grid. I mean, "Italian Art" itself, as an answer, is fine, but to say that it is the Pre-Raphaelite ideal is problematic. As I now understand it, the Pre-Raphaelite Brotherhood was rebelling against standards of art found in Raphael (an Italian) and Michelangelo (another Italian) in favor of the work of the Quattrocento period, which harkened back to the styles of Roman (ok, sort of Italian) and Greek (not Italian) art. So.... kind of confusing.
But let's not get bogged down. MUTED (36D: Like some colors and cornets) had a nice clue, and howzabout OTTOMAN (45D: Raiser of dogs?)!? Nice! Especially so, after the 40D: Grp. concerned with feeding the kitty (SPCA) clue. It was Frannie who got SINBIN (47D: Penalty box, to sports fans), which neither of us had ever heard, but which is funny. And I have always thought DARK (20A: Giving no performances) a wonderfully descriptive theater term.
Lastly, I looked up ERICAS (46A: Bell heather and tree heath). I didn't know the term, but was not too surprised to learn that it is a genus of flowering plants. We have nieces named Erica and Heather, and it is interesting to learn that their names are basically the same!