This is not a great DAC overall. Sound is below Lite DAC-50.
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Documentation:
July 9, 2006
June 9, 2006
Lite DAC-50
This is my first PCM63 DAC. It uses CS8414, DF1704 and PCM63P-k x 2 pcs. The IV is resistor with 6922 SRPP tube output stage design. Overall the sound is smooth but it lacks of details. It is more or less the problem of SRPP and output drive is not good enough for most transistor preamp due to high output impedance. Thus it will also be sensitivity to signal cable used.
First modification is to use D1 mosfet IV, the result is improved on clarity and details.
Second modification is to use Jfet IV (K170BL). Later the IV is upgrade to K369BL in Jan, 2010.
Third modification is to add super low noise regulator.
Fourth modification is to add a power transformer and also two output audio couple transformer for balance mode.
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October 14, 2005
Tannoy Turnberry SE
This is the biggest speaker I ever own so far. Due to its size and small room in Hong Kong, I have to gave it up after 3 years use in 2006. I use 300B to drive it but with its 90dbslp sensitivity, it is still unable to drive it to satisfactory sound level and quality. Later I build a Aleph 60 and it sound much better but the booming is still there due to small room effect. So I have to gave it up and sold it for 10k HKD!
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October 10, 2005
Dynaudio Contour 1.8 MKII
This is a very nice speaker I brought in 1995. I sod it out in 2005 and I am a bit regret to sell it!
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November 13, 2004
AX-100
This was the biggest amplifier I ever made so far. It weights more than 35kg each mono block. I use total 1kV transformer and 3 big heat sinks for each block. This give me about 100W pure class A and the bass strength is just super! It is also very hot and consume about 300W power for each block. Unfortunately the sound for mid and high frequency is not very smooth but it is great to drive low frequency speaker.
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