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RE: Note to folks performing my PAS RIAA mod

Posted by Joe Curcio (M) on March 24, 2011 at 11:09:02

In Reply to: RE: Note to folks performing my PAS RIAA mod posted by sbalfour on March 23, 2011 at 20:19:13:

You are right - all of the components (but for the 2M resistor) are within 5% - however, in total the response departs from spec significantly especially below 100Hz. Plus, those values already account for 5% of error so when added to the tolerance of the new part, you may be off by 10% or more. So it is misleading to suggest that only the 4M7 resistor be changed.

I have not addressed the tape (NAB) eq since most folks will want to run one or more turntables and my mod provides this capability. If you plan on making a collection of recordings from a tape head I would suggest that you make all of your recordings using the stock PAS in the tape position and then perform the mod for your subsequent Phono recordings. If OTOH you will need the use of a direct tape head input frequently, you may want to not perform the mod.

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