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THE POSEIDON PROJECT

As a direct consequence of the international success of our flagship horizon DAC, we decided to trickle down some of the solutions and most of the sound character (or its lack) to the more affordable products.

During the creation of the amazing, game changing POSEIDON DAC we realized, that it offers the best preamp linestage circuit we ever designed. This is how the Poseidon Preamp was born. We removed the digital conversion engine and the preamp as a stand alone device replaced our previously best preamp.

 

Enter: THE POSEIDON PREAMP

 

We realize that the preamplifier or line stage is almost extinct in today's market , but NOT DEAD YET.
In many cases when you want a very good amplifier, you end up with two monoblocks or one stereo power unit and hence the need for a preamp is always there. Especially it plays out well when the preamp is tubed and the power amplifier is sold state or hybrid. Including the D-Class amps of today.

Many preamps out there perform the two basic functions: to adjust the volume and to select the sources.

We analyzed the situation and concluded, that there are three more functions which we like to see in a preamp: 

- very high input impedance, to make the sources sound better

- very low output impedance, to make the amps sound better

- balancing of SE signals to drive the XLR balanced amps (like a single ended turntable (phono) driving the XLR monos.)

The POSEIDON DAC already has most of the preamp functionality in place, so if you can get a Poseidon DAC you dont need a preamp at all.

From May 2024 we will offer an optional preamp card with PHONO MC tube stage with one MC input and sound quality based on our copper VP-4 which was used as a base design for the Poseidon Preamp Phono Card. This card will be retro-fittable to the preamp.

MSRP list price is 

- 23 000 Euro netto for full Poseidon DAC with preamp

- 23 000 Euro for POSEIDON preamp with the tube phono stage MC (no DAC)

- 17000 Euro for line stage version of Poseidon Preamp (no DAC and no MC input)

- Poseidon with the DAC and Phono MC is not possible due to the lack of space inside.

 

Sound wise, the stand alone Poseidon preamp is better than any DAC we ever made used as preamp , as well as  any preamp we ever made.

The design criteria were among others:

1. To maintain the chassis size no larger than that of Pacific or Horizon

2. To offer single ended and balanced topology at the same time, without the need of choosing one

3. To offer volume control, display and remote control to everyone, without the need of choosing

4. To create the volume control circuit that is NO SONIC COMPROMISE. It just can't be bettered in form of any other  technical solution

5. To offer FOUR single ended and balanced ANALOG inputs, usually one XLR and three RCA's

6. To eliminate the input impedance problems that plague typical preamps

7. To eliminate output impedance weakness that plagues the typical tube products

8. To use easily available tubes, which is important in these VERY troubled times. This is important for us, manufacturers - today, and for you - users - tomorrow.

9. To provide a unique feature of SE analog inputs becoming really balanced at the outputs. So our turntable or tape deck can drive directly the balanced amps. This is done in a very clever way by means of a common cathode phase inverter.


The resulting PREAMP is a masterpiece of good sound and convenient features.  It has everything it can have, all the important features of the center of home entertainment. It is specifically designed to work well with modern amplifiers, including the very big solid state ones. 

Key highlights

  • No silicon anywhere in signal path

  • Silver wiring inside

  • Copper foil, true metal sheet Lampizator capacitors in the signal path

  • CNC milled sub-chassis.

  • 6N1P input buffer tubes, 6N1P voltage gain triodes

  • 6J5 or 6V6 or 6C2C or KR5 or CV1067 or L63 output driver tubes

  • Volume control of the highest possible caliber in every unit with 63 discrete steps

  • Channel tracking - within 1% on the volume scale

  • All units are truly balanced and SE at the same time

  • Zero feedback, neither local nor global

  • Zero opamps

  • Tube rectified power supply

  • Hundreds of tube rolling permutations.

 

Preliminary parameters:

  • Weight: 24 kg / 55 lbs net, 40 kg / 90 lbs gross

  • Dimensions without tubes: 440 mm W x 550 mm D x 170 mm H (height with tubes 250 mm)

  • 2 x analog input RCA, 2 x analog input XLR fully balanced

  • Output impedance: 400 Ohms per phase

  • Input impedance 470k per phase. 0,9M balanced

  • 1 x analog output pair RCA and 1 x XLR balanced output (working simultaneously)

  • Output level: 0dB full level @3V peak sinus 1 kHz  per phase, 6V p-p for balanced

  • Mains 110-115 - 220 - 230 - 240 V AC  /       consumption 85 VA

  • Frequency response 15Hz-100 kHz @+/- 1,5 dB, >2 Hz-500kHz @ +/-6dB

  • Overall amplification factor: 4x (6dB) - tube dependent (max 8x)

  • Maximum possible amplitude output: 11V SE, 22V Balanced

  • Volume setting to obtain 2 V output with standard digital source of 0dB: -10points  SE, -15 points Bal

  • Volume maximum signal output with standard digital source of 0dB: 3V SE, 4,7V Bal

  • Input sensitivity  @2Vpp output signal and max level setting: 625mV SE, 160 mV Bal

  • THD @ 2V output: 0,09% SE, 0,02 % Bal

Colors:  (sorry: no gold, no anodizing, no car paint (like Mazda Red)

  • Matt Black Hole

The dust cover plate around the tubes on top can be ordered in these colors:

  • Copper Powdercoat- for the famous "Duracell  look"  (Black body and copper top)
  • Stainless steel mirror-like chrome look
  • Black Hole structural matt


Packing in custom hand made flight case


Tube compliment:


1 x 5U4G rectifier or equivalent, 274B, 5Y3, 5C3S, GZ34, GZ37, GZ480, 5AR4WGB


4 x 6N1P dual triode as input buffer or 6N6P or 6N30P or ECC88 or E88CC or PCC88 or 6DJ9 or 6922 or adapter fitted  ECC99, ECC40, VT99, 6F8G,  6900, 12BH7, 5687, 12AU7 12AT7


4 x 6J5 or KR5 or 6C2C single triode as output buffer or 6V6 pentode (without adapter)

All circuit consists of 4 identical mono circuits and each of phases has three tube stages: input buffer, amplifier and output buffer. The remote control for the first time is not before the tubes or after the tubes but in between stages, making it the most transparent and benign volume control ever.


Remote Control  - CNC milled metal "slab" remote with following buttons: Vol Up, Vol Down, MUTE, Power On/Off, Input select



Display: monochromatic OLED  display in Amber color (dull orange)  (non dimming)


 

 

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The sound

The circuit of this PREAMP has tubes, which will reach the full sound quality after no more than 3 minutes from startup and even after just 20 seconds it becomes apparent that the soundstage is like no other. It stretches so wide and so deep that it exceeds the room boundaries and develops in our imagination beyond the walls and ceiling. Within this huge, immersive soundscape we can hear better than before where things are happening - we hear the individual musicians, their instrument, their reverb, their interplay with the recording venue and the other musicians. They seem to be playing more like a whole (band) even if we hear them more clearly also as individuals. The bass, which "technically" goes down to half hertz, has no bottom limitations and within the low octaves has much more colors, character, detail. Instead of a typical boom-boom, we hear the bass nuances - strings, bodies, reverbs, intonation.

The sound character is very detailed, very resolute, but not in the incissive tiring way.

Some people say, that a preamp can not make the source sound better, it CAN ONLY TAKE AWAY LESS but never ADD anything. Well, this is not true.
While it seems a logical statement, there is a flaw. The source CAN sound better if the next component driven by the source has higher input impedance than normal.
(in this scenario - our preamp)

EXAMPLE: a typical tape deck can have a declared frequency response of 20 Hz to 16 kHz because the manufacturer assumed a 20k load of the integrated amp. With our 270k Ohm input, the same DAC can measure 15Hz to 19 kHz frequency response.

Also the fact that our SE sources will become balanced signals at the output means that they will sound much better than in a "normal" situation where only one phase plays music or where a converting balancing signal transformer or opamp is being used.

In todays world, a precise volume control is  of paramount importance, because when we jump between files in a streaming service - every song has a different OPTIMAL LEVEL at which it can be enjoyed. For a given listener - for every song - there is ONLY ONE proper volume, and no more and no less. Without remote controlled and precisely stepper 64 level system - it is not really practical.

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