digi01

Hi Mackie,thank you very much.translation very clear:yes:

Sorry,I cannot express my meaning well in english.So,I have to try post it in simplicity chinese encoding use GB. MJ的声音特点： 给我印象最深刻的是中频，中音的声场非常好，细节丰富。 高音甜美，感觉象丝绸一样，很唯美很优雅。尤其是听女声独唱。小提琴的拉弦感非常真实！ 低音不松散，但动态稍微弱一些。 总的来说，MJ不适合听大动态的电子舞曲，适合听流行，和品味古典。 另外，mj的声音好坏，很大程度取决于tube的品质。

Guys...this one is not working...the specs of trannies is 230V or 115V primary with 2x12V seconday..., meaning it is a step down trannies...in real life application, u wouldn't want to work it as a step up trannies... .. actually, B+ tolerates a big range of voltage value. from 90VAC to 160VAC, it will work. Slight voltage drop is not a major problem. this is my first MJ mini tube amp.the transformers is standards 220V/18V and 220V/24V.

Hi mukegile, there are two rectifier method in my power supply board,one is solid diode bridge,the another is tube(6X4 or 6Z4). as you know,the tube rectifier is high cost.it needs a special transformer for tube.the transformer is expensive So,in the standard KIT,advice solid rectifier.

YES,165VAC is enough for B+ used.

about the 2 transformers hook method,analysis here: the 18VAC transformer directly powered the tube filaments connected in series.and the second step-up transformer converted the 18VAC to about 165VAC(transformer formula,U1/N1=U2/N2,220*18/24=165)which was then rectified and filtered with my power supply parts to output 220VDC. the voltage trace: in 220VAC=>the first transformer=>18VAC=>the second step-up transformer=> 165VAC

NO,it is DALE 1K 5W 1% resistors. here are part list (standard KIT) main PCB: ELNA standard 220uf/400v* 2 (for out put) ERO 0.47uf/630v resistors: 147/3W*2 ,CGW 31.6K/3W*2 , CGW 100,*2 ,1/2W DALE 182*2 ,1/2W DALE 267*2 ,1/2W DALE 750*2 ,1/2W DALE 10K*2 ,1/2W DALE 20K* 2 ,1/2W DALE 1M* 4,1/2W DALE tube 9pins socket*3 interface socket 4pins*2,2pins*2 RCA golden*4 POT,alps18*2 (or alps27 blue*1) POWER SUPPLY BOARD: 47uf/450v elna standard caps*3 3W 1k*3 DALE diode 1n4007 *4 SOCKET 4Pins*2,2pins*1 hook wires,some...

I am glad show this project. this is my mj mini tubes headamp board.the kit is available.

this is my 3886igc power amp PCB board,dual mono mode design. top view bottom view this is zen headamp PCB boards

SMD8 chip solder

the board is available now please notice,it is golden pad.

I think screwing is good method. soldering may add additionally materials.additional materials that might degrade the sound

here are some DIY cable article http://www.tnt-audio.com/clinica/diycables.html wish that can helps

I like OSEL RCA plug,it is so good. such as OSEL RCA-807 golden,it has eight leaning teeth,can fit 8mm diameter cable.

great work bpribadi,and great drawing too

main boards details,the chips that I use is AD823+TL072.

this is my protel project preview:

the head-fi DIY forums is maybe a no freeplay area.when somebody start a group order,then his thread always disappear.just like jigger and digi01.but somebody thread is long live and get hot reply my mini tube amp is stil in progress. digi

thanks for you appreciation for N@Z,the case is a OEM product.the letterings is that factory fascia,'DUN MEI' mean beautiful. the amp as seem as a upgrade cmoy,just add a ground amp stage in common.It uses 3 single channel opamps to directly drive left, right, and ground channels.

thank you bpribadi it is vrey common 9V cell,cheap but long live.the amp parts of top grade,such DALE and Philips resistor,WIMA and Panasonic FC caps.and use scsi cable for P2P building.

please check out this page for more pic and sch file.

hello all, I can get the opa627 & opa637 at much cheaper price because i can deal directly with TI China. To be fair to the international market, i think i will limit the number of orders. i think i might have some problem if ship too many chips at once without tax if i can include case or VOL pot, it would be better

bpribadi,maybe I can help you get the good case. such as this OEM case,the size is 100x60x200mm,pre-drill vol+headphone out jack+ac power+input.

A better substitute, you can use SCSI cable inside the computer , scsi cable of the rank of the server is especially good for point to point and holes boards soldering.