Copyright 1990 The Chronicle Publishing Co. The San Francisco Chronicle OCTOBER 28, 1990, SUNDAY, SUNDAY EDITION SECTION: SUNDAY DATEBOOK; Pg. 44 LENGTH: 1024 words HEADLINE: Jellyfish Jams to a '70s Beat - Bay Area Bell-Bottomed Rockers BYLINE: TOM LANHAM, SPECIAL TO THE CHRONICLE BODY: IT WAS a conventional workday afternoon in San Francisco's North Beach district, but at Cafe Puccini a rather unconventional argument was taking place. ''No, no -- it was Clarence Williams III,'' insisted the lanky long-haired lad in bell-bottom trousers and a Dennis-the-Menace cheesy shirt spattered with a dalmatian/fire hydrant motif. ''Uh-uh, it was Buddy Miles,'' countered his diminutive dreadlocked chum, who was sporting brushed-denim elephant bells, a ''Bobby Sherman'' leather choker and buckled boots he adoringly called ''Greg Brady specials.'' The two musicians -- Andy Sturmer and Roger Manning, respectively -- were trying to settle a simple question: Which '70s entertainment figure boasted the biggest Afro hairdo. The winner, they eventually decided, was Roberta Flack during her ''Quiet Fire' ' period. Both 24, Sturmer and Manning are hula-hoop serious about any subject relating to their favorite decade. And, as the songwriting team behind Bay Area sugar popsters Jellyfish, they've been on a quest to relive the era of bubble-gum anthems, wholesome tele vision sit-coms and outlandish fashions. Their music, according to Manning's reference points, sounds something akin to ''The Banana Splits Meet Queen.'' Focusing on a growing revival of kitsch '70s hipness, ''Entertainment Tonight'' profiled Jellyfish this summer, featuring the band's vast wardrobe of glitter-age togs that Sturmer swears ''we've been collecting since high school.'' But the quartet's chee ry approach -- heard on their Charisma Records bow, ''Bellybutton'' -- comes close to the sugary glaze of 10CC, and has made inroads of its own. The Radio and Records trade report recently listed Jellyfish's single ''The King Is Half Undressed'' in the To p 20 on the alternative chart, with ''Bellybutton'' a few slots away from the album-oriented rock Top 40. The Sturmer/Manning duo can sip soft drinks in a hometown coffeehouse without stirring up much fuss, but elsewhere a great deal of confusion follows them. At a lavish Los Angeles party the band attended while recording its album last January, Sturmer rec alled bumping into one of his all-time cultural icons, David Cassidy. The ex-teenage heartthrob and anchor of the campy comedy ''The Partridge Family'' didn't take kindly to his zealous fans. ''He wouldn't believe us -- he thought we were making fun of him,'' says vocalist Sturmer, who fronts Jellyfish from behind a zany stand-up drum kit. Keyboardist Manning was equally perplexed: ''He didn't realize I'd just purchased his Colorforms set for $20 in mint condition!'' He frowned, dramatically daubing a vintage frilly sleeve at a make-believe tear. Sturmer and Manning gleefully bat their musical influences about like kittens with a ball of twine: Cheap Trick, The Sweet, The Carpenters, the glam metal group Angel. And the then-controversial album both had to sneak into their homes as teenagers, the camp classic ''Kiss Alive.'' They even unexpectedly break into an a capella version of Ray Stevens' ''The Streak,'' after which Manning pointedly acc uses reggae star Bob Marley of having lifted the theme song for ''The Banana Splits'' television show for his ''Buffalo Soldier.'' Sturmer -- who once was hired by Sea World to dress like furry Banana Split Fleagle and greet visitors -- convulses with lau ghter. ''When you're an artist, you work to create an illusion,'' reasons often-befuddled Jellyfish manager Chris Coyle. ''But this is actually where they're coming from -- they're part of the TV generation.'' He's watched the group create its own distinct soun d and style from scratch. As backing members of Chris Ketner's Beatnik Beatch combo, Sturmer and Manning kept their odd fetishes in check until last August. Then, Sturmer says in a reverent whisper, ''it was uncomfortable for everybody and the band just exploded.'' Ketner went in to electrical contracting, and his confederates, with guitarist Jason Faulkner and Roger's brother Chris Manning on bass, went headlong into another era. ''We wanted to cut the cord and start anew,'' Sturmer explains, while Manning works to clarify ''that our music isn't retro -- we just draw from the record collection we grew up with.'' After a healthy bidding war, Sturmer recalls being ''offered the current, in-vogue producers-of-the-week.'' The ''most obscure find available,'' Jellyfish decided, was ''Saturday Night Fever'' maestro Albhy Galuten, who gave ''Bellybutton'' the historic flavoring the band desired. Picture four-minute Top 40 sensibilities distorted through the neon-hued eruptions of a lava lamp. This is rock music at its brainiest. ''She Still Loves Him'' sways with ethereal Beatles harmonies. ''Baby's Coming Back'' is as blushingly corny as ''The Partridge Family's'' ''I Think I Love You'' and the power-pop ''I Wanna Stay Home'' could nestle sa fely on any ABBA album. ''The King Is Half Undressed'' and its attendant Dr. Seuss-inspired video -- in which Sturmer dons a magic cornucopia of a top hat -- makes the Jellyfish premise clear: What good is nostalgia without a healthy helping of humor? Outside of songwriting, Manning and Sturmer don't appear to take many things seriously. Giggling, they compare notes on respective toy collections and ponder the worth of ''Land of the Lost'' board games and Rodney Allen Rippey pillow dolls. ''You rememb er how Kiss albums all had that same smell?'' Sturmer suddenly asks. Manning looks lost in reverie. ''Yeah,'' he sighs. ''Like they all came from the same packaging plant. You open one up and it's total childhood memories.'' With a post-baby-boom generation now wistfully looking back on the '70s, is a revival in full swing? Manning isn't so sure, but he doesn't mind Jellyfish being labeled the movement's flagship. ''That's fine, whatever,'' he says, adjusting the peace sign on his choker.'' This is the kind of thing we always wanted to do, and we finally got an opportunity to do it.'' Adds Sturmer: ''We've come out of the closet.'' ''Uh, these have come out of the closet,'' Manning clarifies, encompassing Jellyfish's foppish Sunday finest in one sweeping gesture. GRAPHIC: PHOTO,Jellyfish, clockwise from top left, Chris Manning, Roger Manning, Jason Faulkner and Andy Sturmer