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The newest Grado Phono Preamp, model PH-1, represents the most successful solution to one of the most complex technical challenges in the field of audio. Grado’s design goals were for a truly superb sounding phono preamp to work equally well with both low and high output cartridges with negligible noise. They created a phono preamp with ultra wide band pass, high overload, virtually perfect RIAA amplitude and phase coherency, and very low output impedance.
The new Grado phono preamp circuit design now has all of the advantages of the old methods, yet none of its antiquated disadvantages! The processing problem has been split into two separate parts: a forward propagating signal current and a back propagating error voltage. In this design, feedback closure ratio does not change with frequency, but the total output gain does. Virtually all latter stage noise disappears! The output impedance is very low, with the EQ stage opened-loop and the closed-loop gain being the same.
The result is unprecedented improvement in your turntable cartridge openness, greater depth of field and increased definition to the sound of each musical instrument. The PH-1 offers a true freedom from past sonic problems along with Grado's usual warm, smooth, full bodied, non-fatiguing and rich sound qualities that everyone has embraced.
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