Pondera Reference Preamplifier


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The Pondera Reference Preamplifier is our design effort, to push the envelope of tube audio pre-amplification .
This extravagant machine was conceived after many tests with numerous designs, technologies and materials.The heart of the preamplifier, lies in our latest achievement, called N.O.I.E.S (Negative Output Impedence Energy Supply). This proprietary design ,top materials used and cost-no-object approach is the main reason for the preamplifier’s performance.

The power gain is maintained by a single ended-transformer coupled tube stage, using one 814 DHP thoriated tungsten tube. The key to thisstage supreme performance lies to the Negalive Output Impedance Energy Supply. This energy supply has a negative internal resistance throughout the audible spectrum, without the use of feedback or feedforward techniques, so no sonic artifacts are present.

In fact, the negative impedance is compared to a power tube’s transconductance. Where even the best power supply fail in extreme transients needed and sag out, our Negative Output Impedance Energy Supply not only does not sag out, it even contributes to the gain of the preamplifier.

Output to the terminals is provided by a special bifilar windedamorphous double C-core transformer, with an an exceptional wide bandwidth of over 110 Khz. The internal construction of Pondera Reference Preamplifier is a true dual mono design with separate power and bias circuits giving superb chanell separation.

It is not an hyperbole to suggest that the driving capabilities of the Pondera Reference Preamplifier are not matched by anything on the market today.

Levels of 250 Vrms of output are an ease for our preamplifier, pointing out the capabilities of the N.O.I Energy Supply and the power gain stage. In fact, the Pondera Reference preamplifier can deliver over 14 W of true SET power to your speaker terminals, provided with a speaker output transformer.
Hyperbole? Maybe.



    • Direct Heated Triode transformer coupled stage.

    • Balanced and SE input.

    • Supreme quality multitap input transformer for attenuation.

    • Negative Output Impedance. Energy Supply.

    • Double >500Joule Energy Banks.

    • Ultra High Bandwidth Output double - c core amorphous Transformer.

    • Input Overload >60Vpp.

    • Max Unclipped Output >250Vrms.

    • Tube selection : 4 x 814 power tubes.

    • Dimensions(without tubes) : 580W X 500D X 390H

    •Weight : 70Kg



    Signal attenuation is a the most critical task in an preamplifier. Pondera Reference preamplifier signal attenuation is achieved by the multi-tap inputtransformer, made with special quality mumetal core, and ultrawide bandwidth winding techniques, making sure that this attenuation method is second to none in any aspect.



    The overall speed and transparency level of the Pondera Reference is in a level of it’s own in absolute terms.

    Listening to this design is a real ear opening experience. Hearing is Believing.

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