Thöress Phono Enhancer Description (PDF) Download Manual Picture Gallery

THÖRESS presents
the Parametric Phono Equalizer MKIII...

A highly versatile vacuum tube phono preamplifier which offers MM and MC amplification with excellent signal-to-noise performance in purely active operation mode (without the aid of step-up transformer gain). And, furthermore, unique on- the-fly tone adjustements. More specifically, the frequency response of the amplifier can be controled within wide limits by varying the three de-emphasis edge frequencies f1, f2, f3 by means of three 6-position rotary switches TCSW1, TCSW2, TCSW3, which we call tone selectors. Obviously, this design concept justifies the term PARAMETRIC PHONO EQUALIZER. With selectors in default position the amplifier performs highly accurate RIAA de-emphasis, the most widely used equalization characteristic, given by the NEW ORTHOPHONIC prescription established by RCA along with the microgroove vinyl disc in the late 1940s.

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