FWIW, I was able to measure more resonance on a vertical cut 16" disc
than on a horizontal cut 16" (I have way to many test records). All the
tests were conducted using a center weight, the same one used for transfers.
Corey Bailey Audio Engineering
On 2/15/2021 12:03 PM, Gary A. Galo wrote:
> John and Corey are both correct. Any turntable platter and mat should support the record across its entire surface, in order to keep the record from vibrating during playback. Unfortunately, it's been many decades since turntables with 16-inch platters were made, and those were for professional, broadcast use.
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> Subject: [EXTERNAL] Re: [ARSCLIST] 16" Transcription Turntables
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> I have noticed something with pressed 16" records, as were pressed on vinyl for radio play. They can be rather floppy (cf. Corey's discussion), and I think I am hearing a good difference when I put a heavy center weight on the 16" record. I always use that for regular LPs as well, as a matter of course. Why have the record itself experiencing any kind of vertical motion as it plays? Nothing good comes from that.
> John Haley
> On Mon, Feb 15, 2021 at 2:47 PM Corey Bailey <[log in to unmask]>
>> My restoration turntable is designed for 16" discs but the platter is
>> only 14". So, I use a 1/8"thick, 16" Dia. aluminum disc that I made
>> because I don't want the outer area of a 16" disc unsupported. I also
>> made a mat for it. When you do this, the tonearm gets raised by the
>> thickness of the materials. Although my tonearm is designed for a 16"
>> disc, the extra thickness stretches it to it's limit (visually).
>> However, the cartridge sits flat & tests have shown that the tonearm
>> doesn't care about the extra thickness which, is great because the
>> next step would be to add a shim at the base of the tonearm. A real PITA.
>> I made the aluminum disc because tests revealed some extra resonance
>> on the outside of a 16" disc when played on a 14" platter.
>> Fortunately, I haven't had any calls to transfer a 20" disc. ;-)
>> Corey Bailey Audio Engineering