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Month: April 2019

Nekolab

Den grimme ælling

As in Hans Christian Andersen’s fairy tale The ugly duckling, can a small, insignificant cheap DAC become a well-sounding high-end DAC? In most cases the difference between an economical DAC and a high-performance DAC is found in the analog output stage. Take for example the Douk Audio DSD 1796 (price below 100,00 euros): it is equipped with an excellent XMOS interface and an equally good DSD1796 DAC characterized by 24 bit resolution, 192 kHz sampling…

AIDA LCR RIAA Tube Preamplifier

In my personal persuasion ʺ the fewer, the better ʺ I designed a phono preamplifier with only two gain stages ( to minimize sonic coloration ) and without negative feedback. Mostly, the first stage is the heart, the crucial part of any RIAA preamplifier. Aida phono preamp uses a new all tube high performance circuit with very high gain, low distortion and super low noise. The goal is to achieve the maximum possible amplification at…

Figaro Tube Line Preamplifier

16 dB gain, zero feedback all tube line preamplifier, 500 ohms output impedance. Very short signal path from the 6 inputs to line or tape outputs. State of art components: paper ( or MKP ) in oil capacitors in signal path and PSU, carbon composite resistors, silk parts cathode capacitors. High selected NOS tubes ( two 12B4A, two 6J51p and one 5Y3GT ). Very quiet noise floor ensured by “floating” power transformer, CLCL filter plus…

Macbeth DHT Tube Line Preamplifier

Macbeth…the ULTIMATE Line Preamplifier. 16dB gain, zero feedback, active load DHT tube stage. Double power supply: Tube rectifiers, CLCL regulator plus dual mosfet stabilized stages for HV anode and SLA battery PSU for DHT filaments. LED Display for battery check, internal battery charger. Polypropylene and oil filled polypropylene capacitors in PSU. 6 NOS tubes ( two 4P1L, two E810F and two 6AX4GT ). Only one copper polypropylene coupling capacitor in the signal path. Macbeth…the ULTIMATE Line…

Stiffelio USB DSD Tube DAC

This DSD DAC is dedicated to true audiophiles who want to listen the best vinyl like or reel-to-reel tape sound. Stiffelio DSD DAC is a single USB input and use a class A transformer coupled tube circuit plus a minimalist approach filter to remove carrier data from DSD streaming to obtain a natural pure analog output signal. With Stiffelio DSD DAC you can play all type of music files ( Flac, Iso, Dsf, Ape, Wave….)…

Otello Tube Phono Preamplifier

For a RIAA preamp it’s very important keep a short path for audio signal from input to output. Otello is a tube phono preamplifier, zero feedback circuit with an ultra low noise tube-hybrid power supply. Otello use a passive RIAA network, only one high quality  coupling capacitor in the entire signal path and a star ground circuit with separate path for signal and power supply. Two choices are available for gain: 42 dB for MM cartridge…