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Old 26th April 2014, 04:25 AM   #1
EddieT is offline EddieT  United States
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Default Karlson Patent Question

I have over time buit a Karlson 15, a pair of K12s, a K12 for guitar, a K8 (scaled from K12) and a pair of K4s (scaled from K12). I have a question regarding patents, would it be legal to build K8s or Karlsonator 8s for sale?
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Old 26th April 2014, 04:43 AM   #2
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The patents has long expired...the most recent one i have a copy of is 1968

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Old 26th April 2014, 09:22 PM   #3
freddi is offline freddi  United States
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I don't think there would be much contest. Alan Weiss has a system patent with a little lens for compression driver but a V-slot antenna is an old idea and should cover that aspect . Was the K12 for guitar pretty much stock in dimensions and venting? (Cannabis Rex sounds good imo in the ~1957 style K12 whose plan was published July 1958 in Popular Mechanics)
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Old 27th April 2014, 04:47 AM   #4
EddieT is offline EddieT  United States
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For all the K12s I used plans I drew up from measuring my brother's original K12 purchased as a kit from Allied Radio, I think in 1955. The vent is 7/8" with a 1 1/4" molding lip on the front. Was there any marked improvement in any of tthe later versions of the K12?

I have an original Karlson brochure and he had drawn a big X through the Rocket versions as being non-available. I don't know when I got the brochure.
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Old 27th April 2014, 05:56 AM   #5
freddi is offline freddi  United States
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here's the result of my measurements and Greg B's skilled drafting work for the 1954 K12. A few months ago, I found my original full-size factory blue-print and need to leave it to someone after I pass away. The first Karlsonette featured a 3-position
damping bar adjacent to the rear shelf/lowpass filter.

http://img228.imageshack.us/img228/8...sonetteib7.png

the later K12 found its way to Popular Mechanics in July 1958 with the 6-slit vent cabinet and 10 degree forwards slanted vent panel.

it seemed sometime in the 1960's that John Karlson reverted to a full width rear shelf and either slits or a distributed hole array vent. Sometimes I like a single vent and that will play sine-wave cleaner than the slits.

how did your K8 scaled from the Karlsonette turn out? I have Art Welter's dad's semi-scaled "K8" from the slit vent model and they sound very nice with the BetsyK fullrange.
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Old 27th April 2014, 03:43 PM   #6
xrk971 is online now xrk971  United States
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That is a nice drawing that you and GregB made for all of us. I hope to have a shop one day that can make this. If you want your images stores in perpetuity, upload them as images to the diyAudio site as a part of your post rather than linking imageshack as you have complained of that site losing your stuff. I think diyAudio is going to be around for a long time. Better yet, start a Wiki on Karlsons and upload reference drawings, freq response measurements, impedance measurements - and I know you have a lot. Also, all your great photos of all the various Karlsons could be placed in the Wiki. It would really be a great archive for years to come.
Thanks for sharing all your knowledge with us on the Karlson.
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Old 27th April 2014, 05:01 PM   #7
EddieT is offline EddieT  United States
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Freddi, thanks to you and GregB for the excellent drawing. The only difference of note seems to be the 3/4" molding (in my earlier post I misread my sketch and said 1 1/4" but that included the 1/2" panel) over the vent, mine is in front, yours in the rear. Here is my sketch of measurements that I built to. For the wings I did a full scale pencil rubbing rather than attempting to graph the curve.
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File Type: jpg scan0002.jpg (475.1 KB, 150 views)
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Old 27th April 2014, 05:38 PM   #8
EddieT is offline EddieT  United States
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The scaled K8 is now being used in my shop connected to a Proton clock radio. It's a little beat up but gives much more volume than the radio speaker and far greater sound. I don't recall for sure but the driver may be a Vifa.
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Old 28th April 2014, 03:59 PM   #9
EddieT is offline EddieT  United States
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I haven't really been using the full potential of Google images, but it can give you a lot of Karlson on one page.

https://www.google.com/search?safe=a...%3B2048%3B1536
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Old 28th April 2014, 05:56 PM   #10
freddi is offline freddi  United States
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Default ]

Art Welter's dad's K8 were loosely based on the later K12 and have a lot of vent area - still their Fb is about the same as other K8 so the front aperture must be lowering system Fb somewhat. They sound pretty good with WBAL BetsyK and augmented with a cheap powered Polk 10" "sub"

Click the image to open in full size.
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