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Same idea here, with a prototype disc from the (British) Gramophone 
Company... it is vertical cut and center start: 
http://www.phonobase.org/9340.html

Henri CHAMOUX
The many adventures of the Archeophone phonograph : http://www.archeophone.org/windex.php



Le 07/11/2019 à 17:47, Lou Judson a écrit :
> I don’t do disc, only tape, but a though occurs - why not try it with a stereo cartridge wired for stereo and look at the waveform? Maybe that one is not vertical?
>
> <L>
> Lou Judson
> Intuitive Audio
> 415-883-2689
>
>> On Nov 7, 2019, at 7:52 AM, 6295LARGE . <[log in to unmask]> wrote:
>>
>> The cartridge is wired out of  phase.  That's why most of the other EDDs
>> play beautifully.
>> Thanks,
>> Ben
>>
>>
>> On Wed, Nov 6, 2019 at 5:34 PM Dennis Rooney <[log in to unmask] <mailto:[log in to unmask]>>
>> wrote:
>>
>>> Dear Ben,
>>>
>>> Is your M44 stereo cartridge wired out-of-phase? It has to be that way to
>>> ensure optimal vertical pickup.
>>>
>>> DDR