1803B horn plans available?

[Audiomind]

Out of a labor of love I want to build a set of 1803B multicell horns in wood, anyone know if the plans are available?

Thanks for any help.

[Old Guy]

If you mean official Altec plans, I would say absolutely not. Altec never published blueprints, there would not be "plans" per se. Plans are for cabinets, which Altec did publish.

I would post in all the DIY forums, you may find someone who has made a set and will share.

[Altec Best]

You may want to read this thread at DIY.. This will help guide you through construction..I assume you want to use wood ? There are members here that own 1803's that might be able to give you some measurements but this thread will help you to actually build them... I would love to see you do a build thread on them here if you do go ahead and do them..

The construction of a multicell horn - diyAudio

Edit: It seems the pics in his thread have been lost.

[bowtie427ss]

All you really need are the dimensions for a single cell, and a detail of the collector and throat.

Google Japan is my friend. DIY horn multicell (18 cell) - Page 2

[Audiomind]

All you really need are the dimensions for a single cell, and a detail of the collector and throat.

I wish it were that easy but it is not a conical profile expanding in a linear fashion, so if you look close at the pics each vane is sort of like an airplane wing.

Don't want to end up with interesting wood for a bond fire.................although that might look pretty cool having bond fire flames shoot out of a multi cell!

[Audiomind]

I would have to get the measurements all the way down the cell and not just the mouth exit. I suppose I could plug in the exponential profile with a few rudimentary dimensions but I don't really want to reinvent the wheel. (I swore a vow to give up differential calculus when I was at the college level because I thought I was a waste of time and would never use it again....I may have been wrong)

[alancohen]

If I were doing it...and I might some day if AB throws down the gauntlet on a build thread, I would use a photo looking straight down and just expand the dimensions to make my patterns. The resulting outlines will be very servicable. Of course I'm assuming the vertical members are the same as the horizontal ones. If the opening is square, it should be...no?

Or maybe someone that owns one can trace the outline and scan it. Size doesn't matter, it can be printed to scale.

I fear that execution of the build will factor more into the final result than the starting plans. Making 18, no 36 identical cells will be more of a challenge than the calculus. I would think jigs should be utilized.

[GM]

I would have to get the measurements all the way down the cell and not just the mouth exit.

Plug the length, throat and mouth area into Hornresp and it will calculate the expo flare frequency and then you can download all the details to build it either round, square, rectangular and choose the increment distance. Read the HELP file for all the particulars.

GM

[Audiomind]

You may want to read this thread at DIY.. This will help guide you through construction..I assume you want to use wood ? There are members here that own 1803's that might be able to give you some measurements but this thread will help you to actually build them... I would love to see you do a build thread on them here if you do go ahead and do them..

Yes, I mentioned I did want to use wood. Shame about the pics, maybe they will magically reappear at some point.

[Altec Best]

All cells are identical,just different lengths(805-803,etc..) ... If you make a jig for constructing one cell you will be good to go. Look at this photo you can see all the cells stacked on top of each other on the table.And what looks like a jig at the end of table.For sheet metal though.You can also see all the soldering irons at the end of table as well.

Click on the photo it is expandable.

LANSING MANUFACTURING