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September 21, 2003

Mu-Stage Preamp Tube

Filed under: Tube — Spencer @ 11:18 pm

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.

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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!

Mu Stage Reference Document

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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February 13, 2003

300B Tube

Filed under: Tube — Spencer @ 11:31 pm

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!