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Old 15th October 2011, 05:19 AM   #1
fperra is offline fperra  United States
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I'm getting ready to build myself a couple of ELS speakers and would like to use the inner tube method for tensioning. I'm thinking of building my panels with perf steel 15" wide by 54" tall. Can I get a bike tire large enough for this size? My design will be very similar to Jazzman's, but with 2 10" woofers per side.
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Old 15th October 2011, 12:24 PM   #2
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I doubt that you will be able to find any inner tyre of that size.
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Old 15th October 2011, 03:33 PM   #3
fperra is offline fperra  United States
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That's what I'm thinking. So far the largest I can find is 29" in diameter. I don't think I could stretch that over the film stretching jig.
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Old 15th October 2011, 08:50 PM   #4
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Quote:
Originally Posted by fperra View Post
That's what I'm thinking. So far the largest I can find is 29" in diameter. I don't think I could stretch that over the film stretching jig.

Evidently some people have had success gluing inner tubes together for larger stretching tables.
Building question - Panel Matching

Building question - Panel Matching

If you want to use mechanical stretching for tensioning your diaphragm, another option is to use the tape + fish scale method that ER audio uses. Here is a blog with a good writeup on the method.
Jason's DIY Audio: DIY Electrostatic Loudspeakers / ESLs - The Diaphragms

Alternatively, you can use heat to shrink the diaphragm after attaching it to the frame.
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Old 16th October 2011, 05:56 PM   #5
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Building question - Panel Matching - this link - fully correct
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Last edited by Kontra; 16th October 2011 at 05:58 PM.
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Old 16th October 2011, 07:37 PM   #6
fperra is offline fperra  United States
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Thanks for the info. I was thinking of giving that a try. Any links to wire stator construction. I made some electrostatics quite a few years ago from Sanders' original article in the Audio Amateur with the perforated steel stators. I still have 4 of the output transformes he recommended in that article. I might stick with the pef steel stators, but will also consider giving wire stators a try if I can come up with a simple jig for wire spacing. Magnet wire would seem a good choice.
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Old 16th October 2011, 08:51 PM   #7
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I had Made some stators using some TIG wire and what did was I made a comb using the same TIG wire to hold the longer pieces in place while I soldered in the supporting braces.

I have not finished these yet but atleast the stators are done.
Attached Images
File Type: jpg SPACING COMB JIG.jpg (116.2 KB, 140 views)
File Type: jpg ONE TIG STATOR.jpg (79.7 KB, 135 views)
File Type: jpg CLOSE UP OF MIDDLE SUPPORT.jpg (124.7 KB, 131 views)
File Type: jpg CLOSE UP OF ONE END.jpg (88.0 KB, 128 views)
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Old 17th October 2011, 01:01 AM   #8
Few is offline Few  United States
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This is an approach I used with magnet wire, for what it's worth:
Christening a new ESL wire stretcher

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