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anyone ever seen this?
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The old 'there is nothing new under the sun' strikes again.
Pretty interesting link - thank you!
Nothing opens up...
Do you have a PDF reader on your PC or phone? I ask as that should open up just fine. I was able to open it up easily on my phone, by the way.
Just that you have to do a lot of scrolling to see the one drawing down here cut from the full article in this thread.
Really, nothing new, technique is still employed with current tables, albeit sprung but a lot of modern tables have little to no spring suspensions (Rega's come to mind) so new techniques are employed for those, but the general concept is the same.
Who knew the idea dates back to 1959? I don't own a spring-suspended turntable, however. The beauty of the paver from Home Depot? It probably cost me under $10. Seems to work at least "fine".
I just bought a bamboo cutting board and then bought some gold plated spikes from Dayton Audio via Parts Express, using the Rega configuration, one in the back in the middle, 2 up front in by a couple of the front corners, which are are adjustable for ease of leveling and it works just fine for my Rega. :-)
It opened for me - a 1959 issue of Wireless World (PDF format). I love things like that, so "Thanks!" to elblanco.
I've included the picture of 1950's turntable isolation (I took a screen grab - page 455 in the original). It just says that floor joists, a table, foam, concrete and springs form a mechanical band pass filter between vibration in the floor and the stylus in the groove.
I don't think the floor joists are included in the electrical analogue model, fortunately. Else you'd have to worry about the provenance of your floor.
True, unless the joists count as mechanical ground. But the floor boards themselves are included in the model, as C1. I did leave that out.
Regardless, the diagram reminds me of a VPI turntable base I had years ago with a sandwich of steel plates (with heavy fibreboard glued in between) that was suspended on springs, and the turntable sat on top of that. I don't know if it helped or didn't - I imagine the effect (if any) was subtle. So much would come down to the tuning of that bandpass filter, and there are a lot of variables to manipulate (including the floorboards :-)
That's very true, fortunately, in 2014, my living room's flooring got beefed up with joist supports so it's a pretty solid, albeit wood floor in an old house built in 1908, as far as we know. The kitchen, however is another matter all together for that matter.
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