O.R.T. High Definition Phono Pre-Amplifier.

High Definition Phono Pre-Amplifier.

"After several years investigation in the Class A amplification using jfet implementations we developed a High Definition Phono Pre-Amplifier that benefits from low noise and low distortion possible with those components.

Basically an amplifier modulates the output of the power supply with the incoming signal so the PSU must be clean and fast, especially with ultra-low-level signals from MC cartridges.
We needed a very silent power supply without the issues related with batteries so we searched for the latest shunt technologies that provide very low noise power with very low output impedance, increasing detail and attack.

To provide maximum headroom the shunts are powered by a large R-Core transformer followed by low noise ultra fast rectifiers and special 4 pole EL smoothing capacitors.

To avoid pcb copper interaction we opted for a point - to - point build, using star ground topologies.

All power and ground wiring are made with teflon covered silver cable and the signal is conducted on HQ shielded high purity copper cable."

Principal characteristics:

- Hand built - Double mono implementation.

- Class A amplification without Negative Feed Back.

- Passive Riaa equalization built with high performance parts.

- Two stage discrete amplification.

- Internally shielded R-Core, 120VA Transformer.

- 15.000uF 4 pole EL filtering capacitors for each channel.

- High Current Shunt regulators.

Available in the following versions:
O. R. T. MC Low (57 ~ 62dB with inboard R core TX)
O. R. T. MC High (48 ~ 53dB with inboard R core TX)

For those seeking perfection we also have the special edition:
O. R. T. Reference ST (True double mono with dedicated high definition shunts and external PSU)

All our products can be customized according to our customer requests and we offer the possibility of optimisation of gain and workload according to the specifications of the remaining equipment.

Special tech support by Nick Salamouras (Some designers can actually think "out of the box" and so produce really extraordinary results)

RCruz.Audio - Rua do Leme, NÂș 55 rc/esq, 2750-785 Cascais, PT
++351 21 409 63 52
++351 93 482 47 90


Matej Isak

Mono and Stereo ultra high end audio magazine
All rights reserved, October 2011