Vendo excelente pré de phono para células MM ou MC de Alto Ganho, de construção portuguesa e soberba construção, que acompanhou os magnificos gira discos do Rui Borges em vários eventos nacionais e internacionais completamente revisto e com as seguintes características:

Construção duplo mono.

Amplificação em classe A sem realimentação negativa.

Curva de egualização Riaa obtida de forma passiva com componentes de altas performances.

Apenas dois andares de amplificação por canal recorrendo únicamente a componentes discretos (sem opamps).

Placa interna de protecção contra o efeito de campos magneticos.

Transformador R-Core de 120VA.

Filtragem da corrente através de um condensador de 15.000uF por canal.

Alimentação regulada utilizando a tecnologia de alta corrente.

Poderão obter mais informação na internet
Mono & Stereo:
"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.

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