Phono preamplifiers are perhaps the most difficult audio device to design. A number of requirements must be met simultaneously, such as, high gain, low noise, accuracy in the RIAA curve, low distortion and high overload margin. At the same time, the music must flow effortlessly, naturally, while keeping alive all these special musical characteristics that a proper recording contains: analysis, transparency, depiction of stage and natural spaces, richness of harmonics, dynamics, clear description of low frequencies, highlight the special characteristics of delicate orchestrations, etc.

      Various topologies have been proposed over the years, all of which have advantages and disadvantages. Our effort has resulted in a preamplifier that doesn't compromise in any of the critical areas and takes analog design one step further.

      Ιn this product, an original topology is used that is the result of long-term research. In all passive phono preamplifier implementations additional gain is needed to compensate for the losses of the passive components that follow. This results in higher noise and distortion. In Echo Diastasis PH-79 Reference the RIAA curve is implemented with two active stages, which do not use global feedback. In active implementations, the gain at a certain frequency is as much as needed and no more. The option for a split RIAA gives more control and better accuracy. The two amplification stages are followed by a buffer stage with the ability to drive even the most difficult loads. The power supply uses specially designed EI core transformers to achieve maximum possible RF noise rejection from the dirty wall power. Selected semiconductors and integrated circuits, as well as, top quality passive components are used in the circuit. A high accuracy in the implementation of the RIAA curve is achieved by repeated measurements and value matching. Typically, four out of five components are thrown away in this demanding process.

      Compared to the hugely successful previous version, the new version called PH-79 Reference has improvements in the following areas:

    • reinforced, stiffer frame
    • new redesigned front panel with easier to set switches
    • double capacity in the power supply
    • support the device on aluminum legs that offer vibration isolation
    • two standby inputs so that the machine always stays on and ready to play
    • redesigned PCB with shorter signal path
    • high-quality internal low-capacity OCC wiring
    • use of top quality materials at critical points which are controlled by continuous measurements at all stages of production
    • new output devices that provide more current and can drive longer cables.

      We at Echo Diastasis wouldn't offer another phono preamp on the market if we didn't think we could make a difference. The Echo Diastasis PH-79 Reference continues the tradition of its predecessor, achieving even more in the field of music playback. It is able to effortlessly extract even the smallest information engraved in the grooves of the vinyl record creating a huge and three-dimensional soundstage. The result is musical and precise at the same time. At Echo Diastasis we are confident that we have one of the best phono pre-amplifiers that anyone can buy regardless of price. Whether this is true hearing is believing!

Specifications

• Zero negative Feedback
• Audiophile Dual-Mono Circuit Design
• E-core transformer
• Gold plated Connectors, Teflon insulated
• Inputs: 1 pair RCA (L%R)
• Outputs: 1 pair RCA (L%R)
• Output impedance <20Ω
• Input impedance 47,100,220,470,1kΩ and 47kΩ
• Gain (Selectable): MM 43dB, MC (high) 61dB, MC (low) 67dB
• THD: MM: 0,009 / MC: 0,011%
• Noise floor:
  MM: -90dB (A weighted with 5mV input)
  MC: -79dB (A weighted with 0,5mV input)
• RIAA-equalization curve accuracy: <0,05dB / 20Hz-100kHz
• Dimensions (WxDxH)440x340x147 mm

Pre-79 v.2 was designed to function completely different from the usual preamplifiers. With a whole new volume control module attached, there is no need of a potentiometer (or attenuator) in the signal path. This application is a major step towards the non-alteration and degradation of the original signal, which additionally is achieved without using a negative feedback.

The following have been added to the new Echo Diastasis Pre-79 V.2 preamplifier:

• better, reinforced and rigid chassis,
• new redesigned front panel with easier-to-adjust switches,
• double supply capacity,
• support of the device on aluminum legs with special vibration isolation,
• redesigned PCB with shorter signal paths,
• high quality and low capacity internal OFC wiring,
• use of excellent quality materials in selected and critical points,
• Improved output devices that provide more current and may be able to drive longer cables.

It goes without saying that the Echo Diastasis Pre-79 V.2 is also assembled exclusively by hand with continuous and individual control of all parts up to the last production stage. The choice of materials is made with the strictest criteria and each device is carefully tested before it reaches the hands of the consumer. .

Specifications

• Zero negative Feedback
• Audiophile Dual-Mono Circuit Design
• E-core transformer
• Gold plated Connectors, Teflon insulated
• Remote Control
• Analogue inputs 5 pair RCA (L&R)
• Pre output 2 pair RCA (L&R)
• Output impedance <20Ω
• Input impedance 100kΩ
• Gain 15dB
• Frequency response 1Hz - 200kHz, -3dB
• THD+N c 0.007%, 20Hz - 20kHz
• Signal to Noise -115dB
• Dimensions (WxDxH)440x340x147 mm
• Weight 9 kg

Although the A-79 v.2 is a transistor amplifier, its circuit design is treated as a tube amplifier remaining incredibly simple, leaving the entire design to focus on materials quality and continuous accurate measurements, reaching the desired acoustic result. Furthermore this final result, is derived from intensively acoustic sessions.

The following have been added to the new Echo Diastasis A-79 v.2 power Amplifier:

• better, reinforced and rigid chassis,
• new redesigned front panel with easier-to-adjust switches,
• double supply capacity,
• support of the device on aluminum legs with special vibration isolation,
• redesigned PCB with shorter signal paths,
• high quality and low capacity internal OFC wiring,
• use of excellent quality materials in selected and critical points,
• Improved output devices that provide more current and may be able to drive longer cables.

It goes without saying that the Echo Diastasis A-79 v.2 is also assembled exclusively by hand with continuous and individual control of all parts up to the last production stage. The choice of materials is made with the strictest criteria and each device is carefully tested before it reaches the hands of the consumer.

Specifications

• Zero negative Feedback
• Audiophile Dual-Mono Circuit Design
• E-core transformer
• Gold plated connectors, Teflon insulated
• Output Power 2x100W at 8Ω, 2x150W at 4Ω
• Gain 29dB
• Input impedance 47kΩ
• Frequency response 1Hz - 150kHz, -3dB
• THD+N 0.01%, 20Hz - 20kHz, 10W @ 8Ω
• Signal to Noise -95dB
• Dimensions (WxDxH)440x340x147 mm
• Weight 19 kg

I-79 v.2 combines and integrates the design innovations of the A-79 v.2 and Pre-79 v.2, to a more economic proposition with less power, without lacking in sound quality of the individual units. The I-79 v.2 completely avoids the use of a potentiometer in the signal path, while maintaining the simplicity of its design achieving, speed, transparency and musicality.

The following have been added to the new Echo Diastasis i-79 v.2 integrated amplifier:

• better, reinforced and rigid chassis,
• new redesigned front panel with easier-to-adjust switches,
• double supply capacity,
• support of the device on aluminum legs with special vibration isolation,
• redesigned PCB with shorter signal paths,
• high quality and low capacity internal OFC wiring,
• use of excellent quality materials in selected and critical points,
• Improved output devices that provide more current and may be able to drive longer cables.

It goes without saying that the Echo Diastasis i-79 V.2 is also assembled exclusively by hand with continuous and individual control of all parts up to the last production stage. The choice of materials is made with the strictest criteria and each device is carefully tested before it reaches the hands of the consumer. .

Specifications

• Zero negative Feedback
• E-core transformer
• Gold plated Connectors, Teflon insulated
• Remote Control
• Analogue inputs 5 pair RCA (L&R)
• Pre output 1 pair RCA (L&R)
• Output impedance RCA <20Ω
• Input impedance 100kΩ
• Output Power 2x70W at 8Ω, 2x110W at 4Ω
• Frequency response 1Hz - 150kHz, -3dB
• THD+N c 0.01%, 20Hz - 20kHz, 10W at 8Ω
• Signal to Noise -95dB
• Dimensions (WxDxH)440x340x147 mm
• Weight 15 kg