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Re: [ARSCLIST] Early English Columbia LPs

On 10/06/03, James L Wolf wrote:

>    Can a cartridge wired this way produce a stereo signal reflecting
> right and left groove walls? Or does any stereo cartridge rely on
> vertical movement? Thanks.

The coils in a stereo cartridge are at 45 degrees, so each describes one
wall of the groove.

A transformer-based circuit for deriving sum and difference signals is
in various books, but nowadays it would be easier to digitise the
signals. Then you can invert one and subtract.

Don Cox

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