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In Reply to: RE: Need help with RARE old Altec Lansing horn! posted by Altec Best on May 21, 2012 at 10:03:59
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288's, 291's, 282's etc are all 1.4". At least, the older ones are.
I agree. The early Lansing large format drivers 284, 285, 284B etc. used a 2.5", 16 TPI threaded coupling to the horn and a 1.5" exit diameter. These dimensions were borrowed directly from the Fletcher Horn System built at Bell Labs in 1932. When Jim Lansing converted his driver to the three stud mount in about 1940 (model 287) the exit path was shortened a bit with the removal of the threaded portion and the exit then measured 1.4", as it has remained ever since.
Mmmmmm I will get out my vernier caliper and measure, but I swear my 291's are 1.6" exit
Altec called it 1.4", regardless what it measures.
They all measure 1.4", if you remove the rubber washer there is a step that is 2" and the thickness of the washer.
I have Altec examples back to the Hollywood days with rope seals, all the way to the latest ceramic units (and IPC branded drivers).
This adapter is of no use to me. Both my horns are H-808's, and thus have a 1" throat, that isn't the problem. I seriously doubt that anyone has ever manufactured an adapter like I need, which is why I'll have them custom made.
The problem is that one H-808 has the three hole mounting for an early field coil Lansing 801 (as found on the original Iconic), while the other horn has the two bolt mounting that became standard for the later (e.g. 802D) Altec small format drivers.
With the adapters I'm getting, I'll be able to use both horns for stereo, since apart from the driver mounting arrangement they are identical. I was just hoping that somebody had a tar-filled H-808 that I could swap for one of mine so that I might have a matched pair, instead of having to rig them with adapters.
Any of you old timers have an H-808?
"I seriously doubt that anyone has ever manufactured an adapter like I need, "
They call it a 'C' plate.
The Community Light and Sound adapter looks like it would work. I'm probably still going to have some made locally, since I already started the process. thanks though. Good information.
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