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Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond Bates
Vintage article "A Tuned Pipe for Bass Enhancement" by Raymond Bates
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Old 17th September 2020, 04:16 AM   #11
freddi is offline freddi  United States
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yeah - Art "Weltersys" uses a Keystone shaped terminus in his tapped horn.

Here's Norman C. Fulmer's patent page 2. and link to the patent's PDF

https://patentimages.storage.googlea.../US2787332.pdf
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Last edited by freddi; 17th September 2020 at 04:19 AM.
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Old 17th September 2020, 05:26 AM   #12
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Quote:
Originally Posted by freddi View Post
maybe GM
Don't have the program, sims anymore, but you may recall that when you showed it to me I did a quickie sim with MJK's program and it seemed to be designed specifically for my ~two decades later Altec 421-8H specs. Now all I got to do is see if I still have them as they were a bit different from these: Altec Thiele-Small Parameters

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Old 17th September 2020, 06:31 AM   #13
freddi is offline freddi  United States
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Hi GM

I pulled that plan just now from the Nov, 1951 Radio and Televsion News article

Its just about a constant cross sectional area pipe (?)
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Last edited by freddi; 17th September 2020 at 06:33 AM.
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Old 17th September 2020, 06:35 AM   #14
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Hmm, my memory caught me out yet again ! In retrospect it wasn't Bates, but Norman C. Fulmer's, 'A Corner Labyrinth Transducer' (Scans: p 1 2 3 4) in Radio & Television News: The Karlson Homepage

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Old 17th September 2020, 06:50 AM   #15
freddi is offline freddi  United States
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I got kinda sick tonight but will add a fresh scan - here's what the issue at American Radio History looks like.

Does it need any contrast adjustment? - is it better than the old one ?
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Old 17th September 2020, 07:50 AM   #16
GM is offline GM  United States
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Bummer. It looks good enough, but not nearly as magazine quality [smooth] as the other, though imagine it's too big? to post here. Regardless, yours blows up bigger for me, so prefer it.

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Old 17th September 2020, 09:38 AM   #17
freddi is offline freddi  United States
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IIRC I scanned that one at Ulfman's forum. Not all of American Radio HIstory's scans look good. I'm real queasy tonight - can't kick a stomach bug - need an operation too. Old age kinda sucks
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Old 18th September 2020, 05:57 AM   #18
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'Kinda'?! 'Knock on wood', stomach problems has somehow managed to evade me even though my eating habits over the decades implies I should have had most of it removed by now. Lifelong respiratory ailments has/is the bane of my existence, though surprised Covid hasn't gotten me [yet] when I've been out shopping, eating at restaurants as soon as they reopened, then quickly shut down again due to one or more workers getting sick.
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