Dac tube pre-amplifier

Dac tube pre-amplifier power

Finish tube high voltage wire connection

Test Tube pcba high voltage and cathode bias voltage test

Combine DAC pcba and Tube pcba and make combine signal test

Final placement design

Final test front view

Final test rare view

Final test side view

Office DAC DIY -3 for earphone amplifier

Diy DAC Tube amplifier

Xmos HU200

彈休 Diy earphone tube amplifier

彈休 有三天 Diy earphone tube amplifier

Modify case.

Put on all trasformer

Put in tube amplifier pcb

Finish wire connection

Top View

6x4 6c45pi w SE OPT

xmos ADC

Xmos ADC top view

Xmos ADC bottom view

Connect micro phone 

L/R micro phone install

Mr211 playback 董麗 梅花夢

                               Mr211 Dac tube pre-amplifier
                               Mr211 Vt4c 211 mono mono
                               Mr211 3-ways horn speaker
                               Record by Sony Z5P

Friend's tube amplifier modify

Friend's tube amplifier modify
D3a /6C33

                      Mr211 playback Beyond - 冷雨夜 mp3
                      Mr211 DAC tube per-amplifier
                      Mr211 modify D3a 6C33 amplifier
                      Mr211 3-ways horn speaker
                      Record by Sony Z5P

Handmake DAC w Tube pre-amplifier PCBA under debug and test.

Hand make DAC PCBA test spdif receiver , decoder , Op amplifiers

Modify playback low frequency profile.
Record by HTC Sensation XL SV 01