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Old 22nd May 2011, 04:49 AM   #1
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Default Unusual oval full-range drivers

Hoping to draw upon the experienced eyes and ears of DIY Audio members in identifying these unusual oval full-range drivers that I pulled from an 60s era "Kuba" 6GW8 tube based stereo-console.

Doesn't appear to be any rear-mounted motor structure so I'm guessing that the unusual flared rounded metal protrusions on the front and in the center of the cone are some form of motor.

They don't seem to exhibit any magnetic properties unconnected to the chassis so my guess is they become (energized) magnetized through the low voltage of the OTs.

The basket markings are a mystery to me and the only manufacturing marks on the cones is IREL? A search has yielded no information thus far.

Just wondering if anyone can identify these and offer any comments.

The design and finish are quite interesting and initial tests of these sans-enclosures seemed promising.

Thanks in advance!
Attached Images
File Type: jpg IREL1a.jpg (47.1 KB, 531 views)
File Type: jpg IREL1.jpg (43.9 KB, 515 views)
File Type: jpg IREL2.jpg (40.6 KB, 505 views)
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Old 22nd May 2011, 05:38 AM   #2
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Here is something similar:

Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
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Old 22nd May 2011, 06:41 AM   #3
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How so? Rear profile of your example clearly indicates a magnet/motor structure, albeit, not a substantial one, and no front-mounted metal protrusion of any kind (I know they aren't phase plugs on mine)

Seen many of your examples but they aren't remotely similar to the drivers I have. (Are they perhaps, manufactured by the same "IREL" outfit?)

For some reason I am prohibited from posting pics larger than 175 (or so) kb so perhaps the images of my mystery drivers were too small for you to discern the details I was referring to.

Thank-you nonetheless Wavebourn. I appreciate any possible avenues of exploration.
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Old 22nd May 2011, 06:42 AM   #4
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I have run across a few IREL, i'd have to dig out an archive to confirm or not, but IIRC they are Italian.

Your picture is kind of small, but they are not unique in having a front mounted motor with an alnico slug. I have had both Dual & Pillips drivers with the same.

Anitoly, lovely surround on those, a precursor to the Fostex UDR.

dave

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Old 22nd May 2011, 06:52 AM   #5
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Yes, for some reason I can only post pics of 175kb or smaller. Perhaps because I am a recent DIY Audio member.

Thanks Planet 10. Any idea of the design rationale of a front-mounted motor? Space constraints weren't an issue in the console these were pulled from. What were your impressions of the Philips and Dual examples of such a design?
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Old 22nd May 2011, 06:53 AM   #6
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Quote:
Originally Posted by devilsindetails View Post
For some reason I am prohibited from posting pics larger than 175 (or so) kb
With 175 kb/image you could easily be posting 1000 pixel across images. I do note that your tiny thumbnails are hitting 45 kb... they should be 3-6kb given their size.

One way of getting such an anomalas size is to save a picture in photoshop as a jpg, This can balloon a tiny file like yours by embedding all sorts of metadata. If you are using PhotoShop, use "Save for Web"

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Old 22nd May 2011, 06:54 AM   #7
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Quote:
Originally Posted by devilsindetails View Post
How so? Rear profile of your example clearly indicates a magnet/motor structure, albeit, not a substantial one, and no front-mounted metal protrusion of any kind (I know they aren't phase plugs on mine)
Your speakers look like have the same type of front mounted motors.

Quote:
Originally Posted by planet10 View Post
Anitoly, lovely surround on those, a precursor to the Fostex UDR.
They were called 3GD-38E. I still remember juicy sound of that speakers. I believe it is possible to restore production of this speakers.
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Old 22nd May 2011, 06:58 AM   #8
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Quote:
Originally Posted by Wavebourn View Post
Your speakers look like have the same type of front mounted motors.
I don't see a front-mounted motor on your example though, which is why I am confused by it.
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Old 22nd May 2011, 07:03 AM   #9
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Quote:
Originally Posted by planet10 View Post
With 175 kb/image you could easily be posting 1000 pixel across images. I do note that your tiny thumbnails are hitting 45 kb... they should be 3-6kb given their size.

One way of getting such an anomalas size is to save a picture in photoshop as a jpg, This can balloon a tiny file like yours by embedding all sorts of metadata. If you are using PhotoShop, use "Save for Web"

dave
Thanks Dave. Will try that.
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Old 22nd May 2011, 07:11 AM   #10
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Quote:
Originally Posted by devilsindetails View Post
Yes, for some reason I can only post pics of 175kb or smaller. Perhaps because I am a recent DIY Audio member.
That is not it. The liit is actually 195kb, which is more than large enuff for posting on the forum. Your pictures, when resized & saved correctly should be on the order of 45-100kB

Your pictures are large (in kB) because of how you are saving them

For example the attached image is 49k,

dave
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File Type: jpg EL70-vrs-TB-871.jpg (46.1 KB, 188 views)
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