Stan Ricker

Greetings--------- As a way of further explaining the early Jensen technology regarding the transformered treble control, take a peek at this ebay item------the tweeter's been mangled, but the xformers are pictured nicely; the control is at the end of the "hairy" cable, out of view in all shots------ Cheers, Stan http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3087056258&category=50597

Hi, All! A little more info about the 15-inch drivers in the ST-600 cabinets---both the JHP-52/$47.04 or a JAP-60/$55.53 are really low power by today's standards----14 Watts for the first, and 15 Watts for the second!! The big problem, as you know on all of the Vintage speakers, is that the glue ignited when the Voice Coil got hot, also burning the Voicecoil paper former the wire is wrapped around to form the coil-----------the old glues were made from Nitrocellulose---used to make paint and gunpowder~~~ About the value of the pair; I'm guessing that 450-600 each would be fair------if they had H-510 coaxials or G-600/610 triaxes, the value would be higher, but these later speakers didn't exist when the cabs were first sold---- By the way, the Jensen list prices were JHP-52/$72.00 or JAP-60/$85.00-------- The last year that these speakers appeared in Allied or Jensen catalogues is 1949, so I peg these guys as from late 47 or 48......... Cheers, and thanks for the warm welcome--------this vintage stuff is one area that being somewhat old seems to help!!!!! Stan

Hello-------- This is my first posting on the Klipsch Forum. Bob Crites asked me to check out the Jensen query, so here's what I wrote to him before joining the forum this afternoon------- And please be aware that I'm not "shouting"------I write in caps a lot because i'm lazy; I'm trying to break that habit starting today------- " > HI, BOB--------------10:38, 27 MAR, 2004 > > > I'LL REPLY IN DETAIL THIS AFTERNOON/EVENING, BUT A FEW QUICK OBSERVATIONS NOW------- > > THE TWEETER'S LOW, 'CAUSE THAT'S THE ONLY WAY OUT-------IT'S FIRING OUT THRU THE BASS REFLEX PORT---IDEALLY, TURN THE CABINET UPSIDE DOWN FOR BEST LISTENING!!! > > THE WOOFER'S ACTUALLY A COAX---------5-INCH CLOSED-BACK "TWEETER" MOUNTED IN FRONT OF THE WOOFER-------------ONLY GOES TO ABOUT 11K---IF > YOU'RE LUCKY---THE WOLVERINE T35 IS A GOOD CHOICE, EFFICIENCY & SOUND-WISE............THE "450-600 OHM" TRANSFORMER HAS BEEN DONE AWAY WITH--THE CONTROL MOST LIKELY AFFACTS THE T-35 NOW. > > THE CABINET SHOWN IS ABSOLUTELY TOP CONDITION--IS THE OTHER EQUAL?? > NOT CUSTOM-MADE----WAS A STANDARD JENSEN PRODUCT........ > > SEE YOU SOON, > > CHEERS, > > STAN Now, I can go for more detail------- In my 1947 & '48 Allied Radio Catalogues, as well as a lot of the old Jensen lit I have, the 15-inch coax is either a JHP-52/$47.04 or a JAP-60/$55.53; the cabinets may have been a special-order item from Jensen, as they have a real stock-number--ST-600. The speakers are in both catalogues, the cabs aren't in either. An interesting note about the "Roll-off" high freq control; as you'll note, the system is spec'd at 450-600 Ohms. Many consoles and amps of the day had 500-Ohm outputs available, and the high-freq 4-step control selected one of four secondary taps on the transformer always mounted on these speakers, as well as on the HNP-51 coax sometimes used; the differing inductances of the various taps in conjunction with a few caps gave differing freq response at the crossover point---around 5K. These networks were abandoned in 1949 in favor of a more simplified and effective design. As you may know, 1948 saw the intro of the Columbia LP with its extended freq-range and quieter surfaces; the 4-position Jensen control was a rather sophisticated way to reduce 78 RPM record-scratch; a problem overtaken by history. Also, wide-range live music broadcasts on FM were becoming popular, and demanded new and more accurate speaker technology; for an interesting pictorial on older-but-newer Jensen products, check this site out I discovered last year---and I've been Jensen hunting since 1949! I have no idea who the kind soul is who posted it or when, but my sincere thanks to whomever he may be!! http://www.hifilit.com/hifilit/Jensen/Jensen.htm Cheers to all Stan Ricker, A Jayhawk-62!