An assortment of clips from New York-centric films of the ’60s, ’70s and ’80s might suggest a portrait of grime, grit and squalor — a city that used to scare the shit out of tourists who dared to venture out of the Times Square area. But Jonathan Hertzberg‘s “Dirty Old New York” is not that. It’s mainly a portrait of old analog Manhattan — a world of dicey-looking black guys with big Afros, gas guzzlers, dial pay phones, trash on those John Lindsay-Abe Beame streets, turntables, tube television sets, a co-residing Dustin Hoffman and Mia Farrow, 3/4″ video tapes, VCRs, etc. A nice time-trip thing, but I wouldn’t call it “dirty.”