前級的誘惑（完滿結束）

多些制作圖片給大家看看。

Modi Sir,

Would like to check if the resistor connected to the LED is a 560 Ohms or 5.6 KOhms?  In case I want to have 3 more LEDs for different input indicators, and how to resolve additional power supply to the LED (3 more 6.3v?)?  Also you have mentioned a relay circuit is required, any recommntation on this relay and where to get one?  Should I install one more power transformer for that additional 6.3Vs?

MODI SIR,
假若星期六下午DAC班有位的話............
我同KCA都好想來整機~
如果沒有位就算啦~不要緊~~

終於有機會在家裡試聽，雖然只是接駁了普通的石後級，但已經感受到極大的分別。期待各零件完全 run in 之後，再砌埋部膽後級，就可以盡情發揮它的威力了! :twisted:

至於背景噪聲方面，正如 modi sir 所講實在極小，耳仔貼住喇叭都幾乎聽唔到，比小弟用開的廠機還要靜上幾倍呢! 真係多得 modi sir 傳授的「星型接地大法」! 另外把有交流電的零件 (整流膽、整流子等) 盡量遠離放大線路和盡量縮短訊號線長度應該都有幫助的。

在此再次多謝 modi sir 的教導，雖然小弟以前有不少砌石機的經驗，但從 modi 身上仍能學到很多知識和砌膽機的技巧。雖然可能因學員人數太多的關係，有時未能完全照顧各人不同的需要，但只要主動提出問題， modi sir 一定會盡力解答。其他未完成的同學請繼續努力，珍惜餘下的學習機會，下次一定會有進步!  =D>

最後附上執番整齊靚仔後之玉照，歡迎大家觀摩賜教 #-o

Hi, can anybody send me the schematic diagram of this M7 pre amp??
Tq.

在此多謝Modi Sir抽出私人時間留守至深夜12:00am, 仍然不離不棄，悉心指導。 期待300B後級班再共同努力。

hi   AP  
are you happy  with your tube preamp M7 , how about your feling... i like my M7  too ,  ,

hello cyrus
   are you happy with your tubeamp M7 ,  i like my M7 too ,

前級機膽打直放，要求更高，分體電源，測試中。

MODI SIR,

我同kca今天下午想上來拿回家整少少先,下星期二再完成餘下的,可以嗎?

aykc

[quote:b4c25fe2d4="aykc"]MODI SIR,

我同kca今天下午想上來拿回家整少少先,下星期二再完成餘下的,可以嗎?

aykc[/quote]


六時前要上去拿，KK.Sir在，我不在。

[quote:0a09c9a192="kinkin"]hello cyrus
   are you happy with your tubeamp M7 ,  i like my M7 too ,[/quote]

Hi kinkin,

I like it much.  The performance is beyond my expectation after I've added the 2 pairs of 0.1u and 0.01u Jensen caps.  I've learnt a lot of things from the course.

Will you join the tube power amp course?  I've told William to transfer my UCD quote to the tube power amp, hope to see you there.

Btw, thanks much for your help on building my chassis.

Photo to AYKC:

Take on 8-Mar-2008, M7 reference design from Modi.

Share to all M7 diyer who want to take a look from our reference model.

KK.HO

All photo / text, COPYRIGHT by www.hififever.com

[quote:201413f61a="kinkin"]hi   AP  
are you happy  with your tube preamp M7 , how about your feling... i like my M7  too ,  ,[/quote]
Hi kinkin, 當然係鍾意喇! 100%自己砌出嚟，感覺就好似......自己生咗個仔出嚟咁。而家嘅任務就係要慢慢湊大佢!

kinkin你已中毒太深了，希望你早日康復...........   

如有終極的300B試聽會，你可以帶同前級上來試聽嗎

yes sure ( 當然可以 )  如果有空 ,,,,and one question , can you teach me how to set the  (   Hom 声 )  調到可以接近 0 嗎   ??   , thank you very much  hope every  學員,,,,開声大吉....

KK  sir，謝謝你～

Hi William/Modi,

Can anyone confirm if tomorrow evening is open for pre-amp work?

Hi modi sir, 昨天發現當我扭 volume 掣時或者用手指敲個 volume 旋扭時，右聲道就會發出「轟~轟~」聲 (左邊冇事)，情況同另外一部 Audio Note M7 (用5687膽) demo 機的情況差唔多。當我敲多幾次後佢仲自己發出「嗚~嗚~」聲(好像是起震咁)，後來我拆開個殼，郁下D線/膽後就沒有再出現上述問題。想請教一下究竟是甚麼原因呢? 如有需要我可在星期二搬上來研究一下。謝謝!

[quote:8a189568d1="Cyrus"]Hi William/Modi,

Can anyone confirm if tomorrow evening is open for pre-amp work?[/quote]


下午三時後。

[quote:c0cfb33224="AP"]Hi modi sir, 昨天發現當我扭 volume 掣時或者用手指敲個 volume 旋扭時，右聲道就會發出「轟~轟~」聲 (左邊冇事)，情況同另外一部 Audio Note M7 (用5687膽) demo 機的情況差唔多。當我敲多幾次後佢仲自己發出「嗚~嗚~」聲(好像是起震咁)，後來我拆開個殼，郁下D線/膽後就沒有再出現上述問題。想請教一下究竟是甚麼原因呢? 如有需要我可在星期二搬上來研究一下。謝謝![/quote]

這現象可能是6922有些少下墜，應是接觸不良所引起的，只要將膽插好些便可以，或是加一個膽套上膽好象5687機一樣。

希望大家能於明天出席前級制作班，最後的一堂會安排在今星期六15/3下午二時半，如未能制作完的，可以代工或拿回家制作，試機可於日後再幫各位測試，如有不便請見諒！

hi modi sir
     today bad luck for me ,  my tube preamp   Transformer  very very very hot ,  i  open to see see ,  check the transformaer  damage , how to do it ,   need buy a new one ,

kinkin, there may be something sorted for the power supply section, better to have detail checking before re-install the transformer again, please bring it to modi for checking on this Sat

yes , OK ,  what time can go , thank you very much

第九部誕生了，學員也是第一次接觸，講講感受吧！

第十部誕生了，學員起初只是玩玩的心態，怎知越玩越發燒由二千圓玩到六七千圓了，請講講感受吧！


你這部機如可以的話請於星期六拿上來，我有些改善方法給你。

制作圖片。

kinkin, 星期六15/3下午二時半

雖然花多三、四倍金錢、幾晚開夜車的時間，但比較製作中得到的幾趣，都是值得的。遺憾的是我遲了幾年報名.....
謝謝MODI SIR的指導，為了我們幾次差不多十二點先放學，感激～！
PS 試聽報告及感受稍後張貼！
      MODI SIR , 星期六見~~

第十一部誕生了，學員起初只是玩玩的心態，怎知越玩越發燒由二千圓玩到六七千圓了，請講講感受吧！

第十二部誕生了，學員相信也是初接觸，雖然及不上一些機，但學員也感到心滿意足了，請講講感受吧！

今次的前級班已完滿結束了，多謝大家抽時間去完成了自己的前級，大家可以在這裡講講自己的感受，或有機會登出來的，當大家講完後我會作一個總結。

經過個多星期的聆聽,十分喜歡這部前級的聲音,雖然還有很多地方可以upgrade ,但已十分滿意. 在此多謝modi sir 的悉心教導.

測試中！

Thanks very much for Modi & William's help in finishing the pre-amp with phono input, especially to Modi for his much assistance in making the amp.

I am currently burning it in with the burn in CD and at the moment, it has very much more live like & defined sound when I compair with my old pre-amp when doing the burn in.  I think it'll be getting better with time, have to give it some time before the final word.

However, for phono stage, when I turn the volume to about 9 o'clock, it already has some hum as compaired to 12 o'clock to 1 o'clock as in my excisitng ARC pre-amp.  Any idea if this will improve as it is burn in in time.