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Old 8th June 2016, 07:07 AM
bob orbell bob orbell is offline
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Join Date: Nov 2009
Location: kettering northants.
Posts: 1,700
Default Re: Nice phono stage with subsonic filter?

Hi Gary,/Richard, Morgan Jones book, VALVE AMPLIFIERS, has a section on the RIAA disc stage, a disc stage with IEC equalization includes a 20Hz (7950us) time constant, I do not know what manufacturer to point you to, most just use RIAA, but a Google search may help, just to add to this, WD Phono 3S has 3 swichable low filters, and is a cracker , Jones also points out in his book that the problems you are describing are mechanical, and should be addressed mechanicaly. Back to Richards suggestion, I think you implement the low filter before the RIAA stage, and is simply a capacitor and resistor, but of what value I do not know, so its over to you Richard.
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