Aries Cerat Impera II Signature LE Preamp

Description

A new way of using triodes is born,in fact you can say it is a whole new active component .A component that gives the new Impera preamplifier extra-ordinary performance,unrivalled by any tube or transistor preamplifier stage.

The Impera II pre-amplifier is a showcase of our unique Inverted Triode Technology, a vacuum tube technology innovation developed from our company and utilized in the Impera II series of audio designs.

The Inverted Triode is a unique active element, widely different to any kind of vacuum tube used in audio and tube electronics in general.

Three electrodes , a cathode, grid and plate, are combined to give an amplification device completely different in operation than the classic vacuum tube.

Inside a typical vacuum tube, an electron stream emitted from a heated cathode ,

is accelerated toward a positively charged anode, which has a flat plate structure.

The electron flow is impeded by the grid ,a negatively charged wire-grid structure, placed between the cathode and anode. This operation resembles a typical fluid control valve, hence the name valve tube.

Inside an Inverted Triode tube, the electron stream emitted from a heated cathode, is accelerated towards the anode, now a wire-grid-like structure . The electron flow is now unimpeded since no grid structure exists between the anode and cathode.

Instead, a plate-like structure, enveloping the cathode/anode assembly, called the control “grid” is shadowing the anode electrical field, having a very high negative electrical field itself, thus “pushing” the electrons away from the anode.

This mode of electron flow control is completely different than a triode mode of operation.

The parameters of this new active element, are far different than any conventional triode; the inverted triode actually acts like a virtual “vacuum state transformer”. Instead of having gain, the inverted triode has a gain that of a fraction of unity,just like a step down transformer. The internal resistance is many times lower, and input capacitance is nearly zero.

The extra-ordinary parameters of the inverted triode used (100 times lower plate resistance than a 6SN7 tube, zero input capacitance) ,gives the output stage unrivalled measured performance : 2Hz-500KHz bandwidth , figures unreached by any triode - transformer output stage.

An example of the Inverted Triode’s technical advantage over a typical vacuum tube,ex 300B,is a comparison of the two ,driving the same output transformer.The Inverted Triode tube presented a power bandwidth of 2Hz-500.000Hz where the 300B tube had a bandwidth of 15Hz-100.000Hz. Same transformer, same driver tube, but 5 times the bandwidth for the Inverted Triode tube.

The output stage is driven by the input tube with the help of an amorphous double-C core signal choke.

The output stage is driving a highest quality double-C core output transformer, with bifilar winding technique, which gives the transformer supreme frequency extension and supreme transient signal response parameters.