I remember it is a very hot pre-amp! That was made in April 2004.
April 13, 2004
November 8, 2003
CS4398 Evaluation Board CDB4398
CS4398 is a voltage output 24bit DAC. I have tried to modify this DAC evaluation board using Audio transformer Lundahl LL7902 as the IV filter. The performance is not much different from the original design using op-amps. Overall this DAC do not sound great!
I cannot find any picture yet and I shall post it here when available.
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September 21, 2003
Mu-Stage Preamp Tube
This is a tube pre-amp using Mu-Stage. It use 6DJ8 + 12BY7 mu-stage and 5Z3P rectifier tubes. I use lot of chokes inside also and good Jenson capacitors. The casing is 100% aluminium and is self make one.
Update Sep 22, 2010:
I have upgraded the internal capacitor using some Russian PIO capacitors like KBG-I 0.01u, K40Y-9 0.22u and MBGO 0.25u. The sound become more transparent! Now this preamp is a good match for the OCL PCM1794A DAC! It introduces all the taste of tube on the sound.
See last two pictures above.
I also attached the reference document for this Mu-Stage pre-amp. I use the circuit in the last figure on page 9. Enjoy!
I also take a FFT measurement as below: Output at 2Vrms 1kHz, filter 20 to 30kHz BW.
FFT measurement mu-stage preamp SE
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July 9, 2003
TDA1543 DAC
This DAC copy the design of Audio Note DAC using 4 pcs TDA1543 IC. The overall performance is worse than TDA1541 due to limited performance of the DAC IC itself.
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February 13, 2003
300B Tube
Everyone should own a 300B amplifier once in a life! I am one of them. This is quite a big and costy project and I use all the good stuff that I can afford at the time – Lundahl transformers, choke, Jensen Cap, Elna caps, Multi-cap, Rifa cap, telfon wires and Full Music 300B tube etc… Total spend on that is about US$1200!
Full music tube is lack of bass. Recently I buy a Quiguang 4300B and the bass is much better and firm. The 4300B cost about US$120 per pair. I think 300B to drive mid and high frequency is one of the best sound amplifier!
Update: Oct 1st, 2010
The 300B was upgraded with Russian PIOs, see first picture. FFT measurement is attached below:
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