Tag: ES9018S

Balanced Tube Preamplifier V6.0

Draft web page created to place schematic on it:

Schematics: https://muzgdiy.wordpress.com/wp-content/uploads/2019/04/muzgdiy_preamp_balanced_v63.pdf

Dimensions: 110 x 140mm

Board is equipped with input filter calculated for CS4397 DAC with response:

Link to spreadsheet with gain and IV resistor calculation:

https://docs.google.com/spreadsheets/d/1EEtyUL0yzHBsFajiF484S8neK-u8gXl5srcWeKRWkOI/edit?usp=sharing

BOM for ES9038PRO Current mode Analog Stage: https://muzgdiy.wordpress.com/wp-content/uploads/2019/04/preamp_lampowy_balanced_v60.xls

Preamplifier as an output stage for ES9038PRO DAC:

ECC81 + 6N30P-DR during operation:

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Sabre DAC in good neighbourhood – fully differential analog stage for ES9018S/28PRO.

Board presented below is my own implementation of opamp analog stage for best sounding DACs in the world. Privately I am big fan of Sabre32 chips, especially S and PRO series and I did this board to take the best from of them.

Board is designed to hold digital section under its components. Place for digital board is compatible with my Sabre S and PRO boards and Buffalo ones.

As usual in my projects, I/V Stage uses AD797 (4pcs) opamp which is the best sounding chip for this application. Filtering of output signal is passive like on ESS recommended design. Fully differential output circuit utilizes OPA1632 (2pcs) . Every power supply pin is decoupled with 3 capacitors and connected via their own resistor to supply lines.

Board could be powered in dual mono mode by 2pcs. of +/-15V power supply or by only one in stereo mode. This feature is chosen by placing jumpers on bottom side of PCB.

Board contains very sophisticated muting circuit with:

  • delay during turn on
  • fast detection of turning off by falling slope on supply voltage
  • galvanically isolated connection to ES9018S status pins to detect whether chip is muted or unlocked.

Full set with ES9018S board:

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