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In Reply to: RE: old timey turntable isolation posted by Douger on January 30, 2021 at 07:34:25
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.
Follow Ups:
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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