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Thoress Parametric Phono Equalizer


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Shipping Time: Custom Order


THÖRESS presents
the Parametric Phono Equalizer Series…

These exceptional tube phono enhancers allow on-the-fly selection of the entire range of phono equalization curves used by the prominent record labels throughout history.
In addition, we have implemented subtle tone control facilities to compensate for sound degrading artifacts which may have been introduced during the recording or cutting process of a given record. The Enhancer’s unique tone control circuitry shapes the playback deemphasis curve itself, within wide limits, without the use of any clumsy conventional tone control circuitry. Bass, mid-bass and treble are independently variable by means of rotary knobs.

The Enhancer will allow you to hear much more deeply into the grooves of any kind of record than a common phono preamplifier restricted to RIAA deemphasis, and optimum tonal balance and “good sound” may be restored even to poorly mastered or manufactured discs.

It is well known that tone control is especially beneficial with the reproduction of early monophonic records. Interestingly, most (early) stereophonic records and even poorly produced modern records will benefit considerably from these features too. A more detailed description of the tone control facilities can be found in the manual. Tone control of the kind used in our Enhancers proves to have a much stronger impact in restoring a satisfactory overall tonal balance than simple adjustment of the phono deemphasis curve in accordance with the origin and vintage of the record.

Our Parametric Phono Equalizer is available in 5 versions to suit all kinds of stereophonic and monophonic cartridges, with one version dedicated to single channel mono reproduction. This version is specifically designed  to cover all possible de-emphasis curves associated with 78 rpm records, in addition to the tone control functions provided by the stereophonic versions. A detailed description of these versions and other useful information concerning cartridges and vinyl reproduction in general may be found in the manual.

Thanks to an outstanding circuit topology, amplification of the phono signal is purely active without the aid of a step-up transformer on any input of any version.
Nonetheless, the Enhancer offers an extraordinary signal-to-noise ratio, despite the built-in power transformer which is produced in-house to the highest possible
standard. Even the slightest residual transformer vibrations are prevented from reaching sensitive parts of the amplifier due to the mechanical decoupling of the unit from the case.

Importantly, the output resistance of the Enhancer is low enough to drive long interconnect cables and power amplifiers with input impedances as low as 10,000 ohms without compromising sound quality. Moreover, enough amplification is provided by the Enhancer to drive our F2A11 Integrated Amp directly (avoiding the need of additional line amplification) provided the speaker efficiency is sufficiently high, as is the case with both of our speaker models, and the cartridges used on any MC or MM level input will output not less than 0.35mV or 1mV respectively.

As with our full function preamplifier, the Enhancer is entirely hard-wired, and much care has been taken in arranging each aspect of the internal construction
to ensure the highest reliability, low-noise performance and ease of service. The stereophonic versions of the enhancer are equipped with five NOS tubes, one PCC88, two 12SN7GT and two PC86, whereas in the single channel mono version one PCC88, one 12SN7GT and one PC86  are in service.

  1. Purely active phono circuit, no built-in step-up transformers.
  2. Six inputs, customizable cartrige loading.
  3. Subtle tone control via on-the-fly deemphasis curve shaping.
  4. Dedicated mono version av
  5. Entirely hard-wired.
  6. High quality power transformer.
  7. 230 Vac and 120 Vac mains via transformer jumper

” The Phono Enhancer – fully tubed yet not stereotypically tube sounding – delivered its unique signature in spades. The sweetness of the strings, their absolutely ravishing timbre, texture, the natural flow of the music all delivered in astonishingly immersive fashion. What a remarkable performance. By now you know that i appreciated and loved the Thoress Phono Enhancer as i’ve only loved a handful of the very best. All of them were wildly more expensive so far beyond my reach. I cant swing the price of todays review sample either at the best recommendation you could get from me. Yet don’t take my word for it. try one for yourself. I promise you it wont disappoint.”

Marek Dyba –  Phono Enhancer ( 


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