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Category: Preamplifier

Nekolab

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…

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…

The Red Priest ( Vivaldi )

A terrific line all tube preamplifier fitted with NOS Philips ECC186SQ as voltage amplifier and 5687 for low impedance high current output buffer. Power supply is a fine all tube Shunt Regulator. ECC186SQ is the best ECC82 family tube ever made. The crucial mid range ( male/female voices ) is astouning but unfortunately …this tube now It’s very expensive !! All capacitors are MKP or Paper in oil, carbon composite resistors in the signal path,…