Balanced phono carts

Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

Why on earth are phono cables NOT twisted pair? Common mode rejection of differential amps is the reason for existence of twisted pairs used everywhere for data.

Yes, there would be some extra cable capacitance which could be addressed in a couple of ways, the best being putting the phono preamp in the turntable (short leads, low capacitance).

I suggested a six-wire cartridge to Grado (center ground and two opposite-phase signal leads) which was promptly ignored. That would be backward compatible (with no mods you could use a four-wire connection).

Hum sucks, and it seems easy to prevent by adopting existing twisted pair methods.

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Topic - Balanced phono carts - Lee of Omaha 09:09:07 03/15/17 (7)

The reason Grado rejected that is because - Ralph 09:39:07 03/15/17 (6)

RE: The reason Grado rejected that is because - Lee of Omaha 10:20:12 03/15/17 (5)

Its not the turntables - Ralph 11:25:30 03/15/17 (4)

RE: Its not the turntables - Tre' 11:36:58 03/15/17 (3)

Lo-Z microphones have always been wired that way NT - Alpha Al 17:41:12 03/15/17 (1)

RE: Lo-Z microphones have always been wired that way NT - Tre' 19:11:12 03/15/17 (0)

Right! nt - Ralph 12:43:38 03/15/17 (0)

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