WWII 800 found in the wild

**martyh45** · March 3rd, 2012, 11:26 PM

The woofer looks like Jensen manufacture in person too all but the paint anyway. There are no numbers but IPC numbers visible. The magnet at least 50% larger than a p15LL and the cone seems unusually deep. Tomorrow is full documentation day, I’ll get better pictures then.

Best, Thanks for the help posting the photos. I want to do PDFs for the drawings. Is there a good way to upload those? I did links in the past to free hosting sites for the drawings I did in the past but those free service links don’t seem to last too long.

Kinomat, the horn is grey, the lighting in that part of our shop is awful. I do have the original sled for the horn. There are a few cracks and chips in the horn but they look easy to repair.

**Steve Schell** · March 7th, 2012, 03:08 AM

The horn pictured is indeed the urethane plastic model. These were painted gray, though the foamed plastic was orange. The example I have does not have the metal inserts at the stud holes, though I have seen others that did like the horn in the pictures. To the best of my knowledge these plastic jobs were produced toward the end of WWII when all available aluminum was being used to build airplanes. An old timer told me that these urethane horns were infamous for failing due to cracks. As an aside, I have heard of 415 field coil theatre woofers produced during this period developing cracks in their baskets. They may have been cast in some crummy pot metal at the time, again due to the aluminum shortage.

IPC/Simplex purchased tons of Lansing and Altec Lansing gear. They built projectors but supplied complete systems to theatres, obtaining components they didn't build themselves from vendors like Lansing, Altec Lansing and Jensen. This relationship extended back to 1937; I have a pair of IPC LU-1011 compression drivers that are really Lansing 285 models with the radial slit phasing plug. So far I have found four companies that bought and relabeled the Lansing/Altec Lansing field coil era components: RCA (USA), IPC/Simplex (USA), Raycophone (Australia), and AGA Baltic (Netherlands). There may be more, as every time I think I have seen it all something new pops up!

**Altec Best** · March 8th, 2012, 11:56 PM

Some of the IPC LU-1004's that Marty has.Were definitely manufactured by Jensen under license from Western Electric.Probably right around or just before Altec came into the picture.

Marty does this look familiar ?

1940′s International Projector Corp. LU-1004

**martyh45** · March 9th, 2012, 07:14 AM

I can confirm the woofer is Jensen A15-PM which is the same as Western KS 12004 from the 753C I found this picture in an auction with the Jensen numbers on the KS woofer. The magnet structure on the IPC unit looks like that used on the A12-PM and the bracket holding the terminals looks like a Jensen transformer bracket from the same period. Too bad I don?t have a pair.

http://i142.photobucket.com/albums/r...004/A15-PM.jpg