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Frequency Response of Vinyl, Split from "To get into vinyl, or not?" (TOS #5)
almostmitch
post Dec 3 2012, 20:15
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QUOTE (botface @ Dec 3 2012, 13:49) *
I guess you can expect a factory installed arm/cartridge to be set up properly. I'd still want to check though even if only for reassurance that things haven't gone "off" in transit.


This was something I considered. I will most likely double check things, because as you implied, you never know what kind of beating the box took in transit.
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BFG
post Dec 4 2012, 00:16
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This whole conversation has me intrigued about the technical limitations of vinyl. For example, is there a minimum or maximum frequency that can be "encoded" in vinyl (akin to the ~20Hz and 44.1kHz cutoffs on digital CDs)? Does this differ for 33s, 45s, 78s? Is there a way (based on the needle tip and equipment setup) for a knowledgeable person to precalculate the bands that the most noise interference will likely be in, and thus minimize or remove it? Etc.

It's particularly pertinent as I'm planning to attempt a vinyl-to-FLAC encoding soon.

This post has been edited by BFG: Dec 4 2012, 00:17
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bandpass
post Dec 4 2012, 23:00
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Here's a 'Blue box' needle-drop:


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krabapple
post Dec 5 2012, 15:19
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here it is ripped from the CD (1987 edition)







wish i could figure out image display here ... ermm.gif

But if you look at the full size pic, you can see the tone is straighter and cleaner than the needledrop...and of course the silence before it is blacker. Interesting to see to edit right into the 'lucy abby' bit compared to the needledrop. I presume the CD reflects what's on the the master tapes?

This post has been edited by krabapple: Dec 5 2012, 15:28
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mzil
post Dec 5 2012, 17:32
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QUOTE (krabapple @ Dec 5 2012, 10:19) *
Interesting to see to edit right into the 'lucy abby' bit compared to the needledrop. I presume the CD reflects what's on the the master tapes?

According to this, the 15 kHz tone on the original UK LP version was added manually, and is not on the master tape:


"dog cut"

basic recording- none
additional recording- none
master tape- none
cut into first mono master disk 28 Apr 1967.
cut into first stereo master disk 1 May 1967.
generated 1987.

On LP this 15 KHz tone is not a recording at all, but was cut mechanically into the master disk after A Day in the Life. The dates shown are of the first disk cutting for Parlophone in the UK; it was recreated at unknown dates for other master disks, but was never cut into disks by Capitol for US release. For CD it was created electronically in 1987 and put into the master digital tape used for CD production. "

http://www.norwegianwood.org/beatles/disko/uklp/pepper.htm
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2Bdecided
post Dec 5 2012, 18:29
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QUOTE (mzil @ Dec 5 2012, 16:32) *
On LP this 15 KHz tone is not a recording at all, but was cut mechanically into the master disk after A Day in the Life. The dates shown are of the first disk cutting for Parlophone in the UK; it was recreated at unknown dates for other master disks, but was never cut into disks by Capitol for US release. For CD it was created electronically in 1987 and put into the master digital tape used for CD production. "
I've read that before, but my ears (not to mention the graph above) tell me something is wrong or missing from this description - it's a fairly hissy/noisy and slightly distorted tone on the CDs. In its deficiencies, it seems at least comparable to some of the LPs (though that's a tough call to make).

My early 1970s pressing of Pepper has the reversed-speech run-out groove starting at a different point in the loop from my 1987 CD.

I fear we're heading off topic here wink.gif

Cheers,
David.
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