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High Performance Audio

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Your Perception About HiEnd is About to Change!

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Impera II

& Impera II Signature

 

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…prepare to be surprised.
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.

Signal attenuation is achieved with a uniquely designed multi-tap input transformer, which has special bifilar winding as well ,resulting in excellent performance both in frequency and time domain. The 26 separate taps are switched by small signal sealed relays.

All four vacuum tubes are fed by special quality PSUs, with four individual choke filtered capacitor banks.



The sound or non-sound of the Impera II, is a brand new experience in the audio world , and is achieved by radical new solutions, created after out-of the box research and testing.

Specifications

Maximum gain: X7

Output stage bandwidth: 2Hz-500KHz

Attenuation method : Multi-tap input transformer

Power supply : Double choke filtered quad power supplies

Inputs: 5 unbalanced (balanced as an option), HT pass-through

Output: 15VRMS max unbalanced (balanced as an option)

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Talos Mk2 Reference Phono System

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Introducing the Talos Reference phono system.
The result of our many year research and development in phono preamplification design.
After spending years researching and designing and building /testing various designs,including discrete solid state, tube hybrid, and opamp phono stages,we settled to an all tube,three stage , all transformer coupled uniquely designed phono stage,that brings something new to the analog world. Our goal was to design and built the best phono preamplifier, a unique cost no object implementation.

We strongly believe we have done so.

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A phono preamplifier is generally consisted of three subsystems. The input stage, responsible for the main amplification of the delicate signal surcing from the phono cartridge. This task is extremely difficult. The signal level is only a few microvolt rms, comparable to the noise level picked up to the majority of interconnect cables, and even to the thermal noise of some active devices. So, the input stage must amplify the signal to the last micro detail coming from the vinyl groove, while rejecting the noise coming from external sources such as the cables and the turntable electromechanical system. The selection af the active device used for the input stage is as critical as the design of the topology used.

Operational amplifiers were rejected for this cost no object design. Although their performance on the benchmarks were impressive, all opamp designs failed to deliver the detail, flow and sonic bliss associated with top analog systems.
Many discrete jfet implementations, balanced and single ended, were too, more then satisfying regarding measurable performance. None of them was quite there, and fell short of our expectations, to stand next to an absolute top system. More to that, their high input capacitance presents several problems to the cartridge loading.
Our input stage is a proprietary topology using the E280F super tubes. The input stage is a true differential design.The signal sourcing fom the cartridge is amplified as a perfect symmetrical signal, either RCA(floating) or XLR input is used. Any noise picked anywhere in the signal chain,from the cart pins up to the phono preamplifier inputs, is rejected. The two tube banks parallel-feed (parafeed) two mumetal transformers for complete noise rejection.

The input stage can be accompanied by an optional custom, balanced-to balanced step-up transformer,built to exact customer's needs,to tailor-fit each cartridge used.

The detail retrieval from our input stage is phenomenal.

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The second stage of a phono system is the RIAA equalization circuits. Almost all phono preamplifiers use CR (capacitor-resistor) filters, usually in feedback loops for opamp designs, or between gain stages in some more expensive tube and discrete jfet circuits.
Talos preamplifier could not use but the best possible RIAA equalization technique. A constant Impendence transformer-coupled LRC RIAA equalization subsystem is used. A small transformer loaded tube SET amplifier drives the RIAA transformer system,and the RIAA equalization curve is achieved within 0.2 db in the
audible range, the ultra low constant impedance of the LCR circuit is
virtually sonically transparent.

The third ( output) stage, is a transformer-coupled triode stage, using the E280F supertube. A step-down transformer provides low output impedance, galvanic isolation and more than enough power (voltage and current) gain to drive any device in the market.

 

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The power supply is implemented by 4 very high current tube rectifiers, with quad choke filtering.
All tube heaters are passively filtered by a six stage filter.

The small SET amplifier driving the LCR RIAA and the small SET output amplifier ,are powered by their separate PSUs.

The external power supply is connected to the main chassis via a heavy duty umbilical chord. This ensures complete magnetic separation between the power transformer and the eight signal transformers.

The Talos Series Phono system is our best and final effort in designing and building the absolutely best phono preamplifiers. Accompanied with a top analog turntable and cartridge system , we believe that they are the Top Reference audio source today.

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Specifications:

Gain:  62db  , 80db with optional 18db SUT. Custom step up ratios/impedances available.

Noise: -88db unweighted

Max Voltage out: 15Vpp

Max input overload: Can be used with Very high output MM carts without overload

Cartridge Loading options: Limit-less number of resistor values.Loading modules can be ordered in any resistor value.

Total Weight: 77kg

 

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