有回覆,請自行翻譯:
0147 & 0247 第一級放大不同,表現也不同?
Model 0147A is headphone amplifier with line output. This model has been renewed, it can add optional USB-DAC.
Model 0247 has already includes USB-DAC and it has a different type amplifier architecture.
In the case of 0147A and 0247, the last stage is same. The major difference comes from first stage. 0147A has ordinary JFET differential amplifier. It sounds like an well designed tube amp, warm and relaxed musical tone.
In turn, 0247 has push pull symmetrical discrete BJT amplifier which works as a current feedback architecture (like a ultra fast op-amp). It has high speed and high resolution sound with very wide dynamic range. You can find more information at some DIY website.
Mr. RJM is one of our customer.
http://www.diyaudio.com/forums/blogs/rjm/47-labs-treasure-0247-a/