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?
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>
[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.
[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!
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
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.